CVE-2023-54193 (GCVE-0-2023-54193)

Vulnerability from cvelistv5 – Published: 2025-12-30 12:09 – Updated: 2026-08-05 09:17
VLAI
Title
net/sched: cls_api: remove block_cb from driver_list before freeing
Summary
In the Linux kernel, the following vulnerability has been resolved: net/sched: cls_api: remove block_cb from driver_list before freeing Error handler of tcf_block_bind() frees the whole bo->cb_list on error. However, by that time the flow_block_cb instances are already in the driver list because driver ndo_setup_tc() callback is called before that up the call chain in tcf_block_offload_cmd(). This leaves dangling pointers to freed objects in the list and causes use-after-free[0]. Fix it by also removing flow_block_cb instances from driver_list before deallocating them. [0]: [ 279.868433] ================================================================== [ 279.869964] BUG: KASAN: slab-use-after-free in flow_block_cb_setup_simple+0x631/0x7c0 [ 279.871527] Read of size 8 at addr ffff888147e2bf20 by task tc/2963 [ 279.873151] CPU: 6 PID: 2963 Comm: tc Not tainted 6.3.0-rc6+ #4 [ 279.874273] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.13.0-0-gf21b5a4aeb02-prebuilt.qemu.org 04/01/2014 [ 279.876295] Call Trace: [ 279.876882] <TASK> [ 279.877413] dump_stack_lvl+0x33/0x50 [ 279.878198] print_report+0xc2/0x610 [ 279.878987] ? flow_block_cb_setup_simple+0x631/0x7c0 [ 279.879994] kasan_report+0xae/0xe0 [ 279.880750] ? flow_block_cb_setup_simple+0x631/0x7c0 [ 279.881744] ? mlx5e_tc_reoffload_flows_work+0x240/0x240 [mlx5_core] [ 279.883047] flow_block_cb_setup_simple+0x631/0x7c0 [ 279.884027] tcf_block_offload_cmd.isra.0+0x189/0x2d0 [ 279.885037] ? tcf_block_setup+0x6b0/0x6b0 [ 279.885901] ? mutex_lock+0x7d/0xd0 [ 279.886669] ? __mutex_unlock_slowpath.constprop.0+0x2d0/0x2d0 [ 279.887844] ? ingress_init+0x1c0/0x1c0 [sch_ingress] [ 279.888846] tcf_block_get_ext+0x61c/0x1200 [ 279.889711] ingress_init+0x112/0x1c0 [sch_ingress] [ 279.890682] ? clsact_init+0x2b0/0x2b0 [sch_ingress] [ 279.891701] qdisc_create+0x401/0xea0 [ 279.892485] ? qdisc_tree_reduce_backlog+0x470/0x470 [ 279.893473] tc_modify_qdisc+0x6f7/0x16d0 [ 279.894344] ? tc_get_qdisc+0xac0/0xac0 [ 279.895213] ? mutex_lock+0x7d/0xd0 [ 279.896005] ? __mutex_lock_slowpath+0x10/0x10 [ 279.896910] rtnetlink_rcv_msg+0x5fe/0x9d0 [ 279.897770] ? rtnl_calcit.isra.0+0x2b0/0x2b0 [ 279.898672] ? __sys_sendmsg+0xb5/0x140 [ 279.899494] ? do_syscall_64+0x3d/0x90 [ 279.900302] ? entry_SYSCALL_64_after_hwframe+0x46/0xb0 [ 279.901337] ? kasan_save_stack+0x2e/0x40 [ 279.902177] ? kasan_save_stack+0x1e/0x40 [ 279.903058] ? kasan_set_track+0x21/0x30 [ 279.903913] ? kasan_save_free_info+0x2a/0x40 [ 279.904836] ? ____kasan_slab_free+0x11a/0x1b0 [ 279.905741] ? kmem_cache_free+0x179/0x400 [ 279.906599] netlink_rcv_skb+0x12c/0x360 [ 279.907450] ? rtnl_calcit.isra.0+0x2b0/0x2b0 [ 279.908360] ? netlink_ack+0x1550/0x1550 [ 279.909192] ? rhashtable_walk_peek+0x170/0x170 [ 279.910135] ? kmem_cache_alloc_node+0x1af/0x390 [ 279.911086] ? _copy_from_iter+0x3d6/0xc70 [ 279.912031] netlink_unicast+0x553/0x790 [ 279.912864] ? netlink_attachskb+0x6a0/0x6a0 [ 279.913763] ? netlink_recvmsg+0x416/0xb50 [ 279.914627] netlink_sendmsg+0x7a1/0xcb0 [ 279.915473] ? netlink_unicast+0x790/0x790 [ 279.916334] ? iovec_from_user.part.0+0x4d/0x220 [ 279.917293] ? netlink_unicast+0x790/0x790 [ 279.918159] sock_sendmsg+0xc5/0x190 [ 279.918938] ____sys_sendmsg+0x535/0x6b0 [ 279.919813] ? import_iovec+0x7/0x10 [ 279.920601] ? kernel_sendmsg+0x30/0x30 [ 279.921423] ? __copy_msghdr+0x3c0/0x3c0 [ 279.922254] ? import_iovec+0x7/0x10 [ 279.923041] ___sys_sendmsg+0xeb/0x170 [ 279.923854] ? copy_msghdr_from_user+0x110/0x110 [ 279.924797] ? ___sys_recvmsg+0xd9/0x130 [ 279.925630] ? __perf_event_task_sched_in+0x183/0x470 [ 279.926656] ? ___sys_sendmsg+0x170/0x170 [ 279.927529] ? ctx_sched_in+0x530/0x530 [ 279.928369] ? update_curr+0x283/0x4f0 [ 279.929185] ? perf_event_update_userpage+0x570/0x570 [ 279.930201] ? __fget_light+0x57/0x520 [ 279.931023] ? __switch_to+0x53d/0xe70 [ 27 ---truncated---
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 59094b1e5094c7e50a3d2912202fd30b6a1dadf8 , < cc5fe387c6294d0471cb7ed064efac97fac65ccc (git)
Affected: 59094b1e5094c7e50a3d2912202fd30b6a1dadf8 , < 7311c8be3755611bf6edea4dfbeb190b4bdd489f (git)
Affected: 59094b1e5094c7e50a3d2912202fd30b6a1dadf8 , < cb145932fcf6814e7e95e467eb70e7849a845ae9 (git)
Affected: 59094b1e5094c7e50a3d2912202fd30b6a1dadf8 , < 55866fe3fded3ce94ac3fc1bb3dfce654282f483 (git)
Affected: 59094b1e5094c7e50a3d2912202fd30b6a1dadf8 , < 26aec72429a05e917d574eca0efc5306c63a8862 (git)
Affected: 59094b1e5094c7e50a3d2912202fd30b6a1dadf8 , < 7b7a74ed303d532fb73ae4b1697f16a0fea89cd0 (git)
Affected: 59094b1e5094c7e50a3d2912202fd30b6a1dadf8 , < da94a7781fc3c92e7df7832bc2746f4d39bc624e (git)
Create a notification for this product.
Linux Linux Affected: 5.3
Unaffected: 0 , < 5.3 (semver)
Unaffected: 5.4.243 , ≤ 5.4.* (semver)
Unaffected: 5.10.180 , ≤ 5.10.* (semver)
Unaffected: 5.15.112 , ≤ 5.15.* (semver)
Unaffected: 6.1.29 , ≤ 6.1.* (semver)
Unaffected: 6.2.16 , ≤ 6.2.* (semver)
Unaffected: 6.3.3 , ≤ 6.3.* (semver)
Unaffected: 6.4 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/sched/cls_api.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "cc5fe387c6294d0471cb7ed064efac97fac65ccc",
              "status": "affected",
              "version": "59094b1e5094c7e50a3d2912202fd30b6a1dadf8",
              "versionType": "git"
            },
            {
              "lessThan": "7311c8be3755611bf6edea4dfbeb190b4bdd489f",
              "status": "affected",
              "version": "59094b1e5094c7e50a3d2912202fd30b6a1dadf8",
              "versionType": "git"
            },
            {
              "lessThan": "cb145932fcf6814e7e95e467eb70e7849a845ae9",
              "status": "affected",
              "version": "59094b1e5094c7e50a3d2912202fd30b6a1dadf8",
              "versionType": "git"
            },
            {
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              "status": "affected",
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              "versionType": "git"
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            {
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              "status": "affected",
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              "versionType": "git"
            },
            {
              "lessThan": "7b7a74ed303d532fb73ae4b1697f16a0fea89cd0",
              "status": "affected",
              "version": "59094b1e5094c7e50a3d2912202fd30b6a1dadf8",
              "versionType": "git"
            },
            {
              "lessThan": "da94a7781fc3c92e7df7832bc2746f4d39bc624e",
              "status": "affected",
              "version": "59094b1e5094c7e50a3d2912202fd30b6a1dadf8",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/sched/cls_api.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.3"
            },
            {
              "lessThan": "5.3",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.4.*",
              "status": "unaffected",
              "version": "5.4.243",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.180",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.112",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.29",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.2.*",
              "status": "unaffected",
              "version": "6.2.16",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.3.*",
              "status": "unaffected",
              "version": "6.3.3",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.4",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.4.243",
                  "versionStartIncluding": "5.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.180",
                  "versionStartIncluding": "5.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.112",
                  "versionStartIncluding": "5.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.29",
                  "versionStartIncluding": "5.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.2.16",
                  "versionStartIncluding": "5.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.3.3",
                  "versionStartIncluding": "5.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.4",
                  "versionStartIncluding": "5.3",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: cls_api: remove block_cb from driver_list before freeing\n\nError handler of tcf_block_bind() frees the whole bo-\u003ecb_list on error.\nHowever, by that time the flow_block_cb instances are already in the driver\nlist because driver ndo_setup_tc() callback is called before that up the\ncall chain in tcf_block_offload_cmd(). This leaves dangling pointers to\nfreed objects in the list and causes use-after-free[0]. Fix it by also\nremoving flow_block_cb instances from driver_list before deallocating them.\n\n[0]:\n[  279.868433] ==================================================================\n[  279.869964] BUG: KASAN: slab-use-after-free in flow_block_cb_setup_simple+0x631/0x7c0\n[  279.871527] Read of size 8 at addr ffff888147e2bf20 by task tc/2963\n\n[  279.873151] CPU: 6 PID: 2963 Comm: tc Not tainted 6.3.0-rc6+ #4\n[  279.874273] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.13.0-0-gf21b5a4aeb02-prebuilt.qemu.org 04/01/2014\n[  279.876295] Call Trace:\n[  279.876882]  \u003cTASK\u003e\n[  279.877413]  dump_stack_lvl+0x33/0x50\n[  279.878198]  print_report+0xc2/0x610\n[  279.878987]  ? flow_block_cb_setup_simple+0x631/0x7c0\n[  279.879994]  kasan_report+0xae/0xe0\n[  279.880750]  ? flow_block_cb_setup_simple+0x631/0x7c0\n[  279.881744]  ? mlx5e_tc_reoffload_flows_work+0x240/0x240 [mlx5_core]\n[  279.883047]  flow_block_cb_setup_simple+0x631/0x7c0\n[  279.884027]  tcf_block_offload_cmd.isra.0+0x189/0x2d0\n[  279.885037]  ? tcf_block_setup+0x6b0/0x6b0\n[  279.885901]  ? mutex_lock+0x7d/0xd0\n[  279.886669]  ? __mutex_unlock_slowpath.constprop.0+0x2d0/0x2d0\n[  279.887844]  ? ingress_init+0x1c0/0x1c0 [sch_ingress]\n[  279.888846]  tcf_block_get_ext+0x61c/0x1200\n[  279.889711]  ingress_init+0x112/0x1c0 [sch_ingress]\n[  279.890682]  ? clsact_init+0x2b0/0x2b0 [sch_ingress]\n[  279.891701]  qdisc_create+0x401/0xea0\n[  279.892485]  ? qdisc_tree_reduce_backlog+0x470/0x470\n[  279.893473]  tc_modify_qdisc+0x6f7/0x16d0\n[  279.894344]  ? tc_get_qdisc+0xac0/0xac0\n[  279.895213]  ? mutex_lock+0x7d/0xd0\n[  279.896005]  ? __mutex_lock_slowpath+0x10/0x10\n[  279.896910]  rtnetlink_rcv_msg+0x5fe/0x9d0\n[  279.897770]  ? rtnl_calcit.isra.0+0x2b0/0x2b0\n[  279.898672]  ? __sys_sendmsg+0xb5/0x140\n[  279.899494]  ? do_syscall_64+0x3d/0x90\n[  279.900302]  ? entry_SYSCALL_64_after_hwframe+0x46/0xb0\n[  279.901337]  ? kasan_save_stack+0x2e/0x40\n[  279.902177]  ? kasan_save_stack+0x1e/0x40\n[  279.903058]  ? kasan_set_track+0x21/0x30\n[  279.903913]  ? kasan_save_free_info+0x2a/0x40\n[  279.904836]  ? ____kasan_slab_free+0x11a/0x1b0\n[  279.905741]  ? kmem_cache_free+0x179/0x400\n[  279.906599]  netlink_rcv_skb+0x12c/0x360\n[  279.907450]  ? rtnl_calcit.isra.0+0x2b0/0x2b0\n[  279.908360]  ? netlink_ack+0x1550/0x1550\n[  279.909192]  ? rhashtable_walk_peek+0x170/0x170\n[  279.910135]  ? kmem_cache_alloc_node+0x1af/0x390\n[  279.911086]  ? _copy_from_iter+0x3d6/0xc70\n[  279.912031]  netlink_unicast+0x553/0x790\n[  279.912864]  ? netlink_attachskb+0x6a0/0x6a0\n[  279.913763]  ? netlink_recvmsg+0x416/0xb50\n[  279.914627]  netlink_sendmsg+0x7a1/0xcb0\n[  279.915473]  ? netlink_unicast+0x790/0x790\n[  279.916334]  ? iovec_from_user.part.0+0x4d/0x220\n[  279.917293]  ? netlink_unicast+0x790/0x790\n[  279.918159]  sock_sendmsg+0xc5/0x190\n[  279.918938]  ____sys_sendmsg+0x535/0x6b0\n[  279.919813]  ? import_iovec+0x7/0x10\n[  279.920601]  ? kernel_sendmsg+0x30/0x30\n[  279.921423]  ? __copy_msghdr+0x3c0/0x3c0\n[  279.922254]  ? import_iovec+0x7/0x10\n[  279.923041]  ___sys_sendmsg+0xeb/0x170\n[  279.923854]  ? copy_msghdr_from_user+0x110/0x110\n[  279.924797]  ? ___sys_recvmsg+0xd9/0x130\n[  279.925630]  ? __perf_event_task_sched_in+0x183/0x470\n[  279.926656]  ? ___sys_sendmsg+0x170/0x170\n[  279.927529]  ? ctx_sched_in+0x530/0x530\n[  279.928369]  ? update_curr+0x283/0x4f0\n[  279.929185]  ? perf_event_update_userpage+0x570/0x570\n[  279.930201]  ? __fget_light+0x57/0x520\n[  279.931023]  ? __switch_to+0x53d/0xe70\n[  27\n---truncated---"
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The vulnerability is reached through the tc/rtnetlink qdisc-configuration path (RTM_NEWQDISC via netlink sendmsg), which requires local system access, not a network peer.\nAC:L - The attacker controls every tc operation needed to set up the failing reoffload and trigger the error path, and there is no uncontrolled race; on a common offload-capable NIC the sequence is reliably reproducible.\nPR:L - Configuring tc qdiscs/blocks requires CAP_NET_ADMIN, which an unprivileged local user can obtain in a new network namespace via unshare -Urn, so only low privilege is needed.\nUI:N - The entire sequence is driven by the attacker\u0027s own netlink/tc operations with no victim interaction required.\nS:U - The use-after-free corrupts kernel data within the same kernel security authority; no crossing of a VM/IOMMU/sandbox boundary occurs.\nC:H - The dangling driver_list pointer references a freed kmalloc-192 object whose contents can be attacker-controlled via heap spraying, enabling disclosure of kernel memory.\nI:H - A use-after-free of a reclaimable heap object provides a write/type-confusion primitive that can be leveraged toward arbitrary memory modification and control-flow hijacking.\nA:H - The use-after-free reliably causes kernel oops/panic (as shown by the KASAN report), resulting in denial of service."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T09:17:56.124Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/cc5fe387c6294d0471cb7ed064efac97fac65ccc"
        },
        {
          "url": "https://git.kernel.org/stable/c/7311c8be3755611bf6edea4dfbeb190b4bdd489f"
        },
        {
          "url": "https://git.kernel.org/stable/c/cb145932fcf6814e7e95e467eb70e7849a845ae9"
        },
        {
          "url": "https://git.kernel.org/stable/c/55866fe3fded3ce94ac3fc1bb3dfce654282f483"
        },
        {
          "url": "https://git.kernel.org/stable/c/26aec72429a05e917d574eca0efc5306c63a8862"
        },
        {
          "url": "https://git.kernel.org/stable/c/7b7a74ed303d532fb73ae4b1697f16a0fea89cd0"
        },
        {
          "url": "https://git.kernel.org/stable/c/da94a7781fc3c92e7df7832bc2746f4d39bc624e"
        }
      ],
      "title": "net/sched: cls_api: remove block_cb from driver_list before freeing",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2023-54193",
    "datePublished": "2025-12-30T12:09:00.738Z",
    "dateReserved": "2025-12-30T12:06:44.498Z",
    "dateUpdated": "2026-08-05T09:17:56.124Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2023-54193",
      "date": "2026-10-17",
      "epss": "0.00161",
      "percentile": "0.04902"
    },
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "defaultStatus": "unaffected",
                "product": "Linux",
                "programFiles": [
                  "net/sched/cls_api.c"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
                "versions": [
                  {
                    "lessThan": "cc5fe387c6294d0471cb7ed064efac97fac65ccc",
                    "status": "affected",
                    "version": "59094b1e5094c7e50a3d2912202fd30b6a1dadf8",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "7311c8be3755611bf6edea4dfbeb190b4bdd489f",
                    "status": "affected",
                    "version": "59094b1e5094c7e50a3d2912202fd30b6a1dadf8",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "cb145932fcf6814e7e95e467eb70e7849a845ae9",
                    "status": "affected",
                    "version": "59094b1e5094c7e50a3d2912202fd30b6a1dadf8",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "55866fe3fded3ce94ac3fc1bb3dfce654282f483",
                    "status": "affected",
                    "version": "59094b1e5094c7e50a3d2912202fd30b6a1dadf8",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "26aec72429a05e917d574eca0efc5306c63a8862",
                    "status": "affected",
                    "version": "59094b1e5094c7e50a3d2912202fd30b6a1dadf8",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "7b7a74ed303d532fb73ae4b1697f16a0fea89cd0",
                    "status": "affected",
                    "version": "59094b1e5094c7e50a3d2912202fd30b6a1dadf8",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "da94a7781fc3c92e7df7832bc2746f4d39bc624e",
                    "status": "affected",
                    "version": "59094b1e5094c7e50a3d2912202fd30b6a1dadf8",
                    "versionType": "git"
                  }
                ]
              },
              {
                "defaultStatus": "affected",
                "product": "Linux",
                "programFiles": [
                  "net/sched/cls_api.c"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
                "versions": [
                  {
                    "status": "affected",
                    "version": "5.3"
                  },
                  {
                    "lessThan": "5.3",
                    "status": "unaffected",
                    "version": "0",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "5.4.*",
                    "status": "unaffected",
                    "version": "5.4.243",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "5.10.*",
                    "status": "unaffected",
                    "version": "5.10.180",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "5.15.*",
                    "status": "unaffected",
                    "version": "5.15.112",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.1.*",
                    "status": "unaffected",
                    "version": "6.1.29",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.2.*",
                    "status": "unaffected",
                    "version": "6.2.16",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.3.*",
                    "status": "unaffected",
                    "version": "6.3.3",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "*",
                    "status": "unaffected",
                    "version": "6.4",
                    "versionType": "original_commit_for_fix"
                  }
                ]
              }
            ],
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: cls_api: remove block_cb from driver_list before freeing\n\nError handler of tcf_block_bind() frees the whole bo-\u003ecb_list on error.\nHowever, by that time the flow_block_cb instances are already in the driver\nlist because driver ndo_setup_tc() callback is called before that up the\ncall chain in tcf_block_offload_cmd(). This leaves dangling pointers to\nfreed objects in the list and causes use-after-free[0]. Fix it by also\nremoving flow_block_cb instances from driver_list before deallocating them.\n\n[0]:\n[  279.868433] ==================================================================\n[  279.869964] BUG: KASAN: slab-use-after-free in flow_block_cb_setup_simple+0x631/0x7c0\n[  279.871527] Read of size 8 at addr ffff888147e2bf20 by task tc/2963\n\n[  279.873151] CPU: 6 PID: 2963 Comm: tc Not tainted 6.3.0-rc6+ #4\n[  279.874273] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.13.0-0-gf21b5a4aeb02-prebuilt.qemu.org 04/01/2014\n[  279.876295] Call Trace:\n[  279.876882]  \u003cTASK\u003e\n[  279.877413]  dump_stack_lvl+0x33/0x50\n[  279.878198]  print_report+0xc2/0x610\n[  279.878987]  ? flow_block_cb_setup_simple+0x631/0x7c0\n[  279.879994]  kasan_report+0xae/0xe0\n[  279.880750]  ? flow_block_cb_setup_simple+0x631/0x7c0\n[  279.881744]  ? mlx5e_tc_reoffload_flows_work+0x240/0x240 [mlx5_core]\n[  279.883047]  flow_block_cb_setup_simple+0x631/0x7c0\n[  279.884027]  tcf_block_offload_cmd.isra.0+0x189/0x2d0\n[  279.885037]  ? tcf_block_setup+0x6b0/0x6b0\n[  279.885901]  ? mutex_lock+0x7d/0xd0\n[  279.886669]  ? __mutex_unlock_slowpath.constprop.0+0x2d0/0x2d0\n[  279.887844]  ? ingress_init+0x1c0/0x1c0 [sch_ingress]\n[  279.888846]  tcf_block_get_ext+0x61c/0x1200\n[  279.889711]  ingress_init+0x112/0x1c0 [sch_ingress]\n[  279.890682]  ? clsact_init+0x2b0/0x2b0 [sch_ingress]\n[  279.891701]  qdisc_create+0x401/0xea0\n[  279.892485]  ? qdisc_tree_reduce_backlog+0x470/0x470\n[  279.893473]  tc_modify_qdisc+0x6f7/0x16d0\n[  279.894344]  ? tc_get_qdisc+0xac0/0xac0\n[  279.895213]  ? mutex_lock+0x7d/0xd0\n[  279.896005]  ? __mutex_lock_slowpath+0x10/0x10\n[  279.896910]  rtnetlink_rcv_msg+0x5fe/0x9d0\n[  279.897770]  ? rtnl_calcit.isra.0+0x2b0/0x2b0\n[  279.898672]  ? __sys_sendmsg+0xb5/0x140\n[  279.899494]  ? do_syscall_64+0x3d/0x90\n[  279.900302]  ? entry_SYSCALL_64_after_hwframe+0x46/0xb0\n[  279.901337]  ? kasan_save_stack+0x2e/0x40\n[  279.902177]  ? kasan_save_stack+0x1e/0x40\n[  279.903058]  ? kasan_set_track+0x21/0x30\n[  279.903913]  ? kasan_save_free_info+0x2a/0x40\n[  279.904836]  ? ____kasan_slab_free+0x11a/0x1b0\n[  279.905741]  ? kmem_cache_free+0x179/0x400\n[  279.906599]  netlink_rcv_skb+0x12c/0x360\n[  279.907450]  ? rtnl_calcit.isra.0+0x2b0/0x2b0\n[  279.908360]  ? netlink_ack+0x1550/0x1550\n[  279.909192]  ? rhashtable_walk_peek+0x170/0x170\n[  279.910135]  ? kmem_cache_alloc_node+0x1af/0x390\n[  279.911086]  ? _copy_from_iter+0x3d6/0xc70\n[  279.912031]  netlink_unicast+0x553/0x790\n[  279.912864]  ? netlink_attachskb+0x6a0/0x6a0\n[  279.913763]  ? netlink_recvmsg+0x416/0xb50\n[  279.914627]  netlink_sendmsg+0x7a1/0xcb0\n[  279.915473]  ? netlink_unicast+0x790/0x790\n[  279.916334]  ? iovec_from_user.part.0+0x4d/0x220\n[  279.917293]  ? netlink_unicast+0x790/0x790\n[  279.918159]  sock_sendmsg+0xc5/0x190\n[  279.918938]  ____sys_sendmsg+0x535/0x6b0\n[  279.919813]  ? import_iovec+0x7/0x10\n[  279.920601]  ? kernel_sendmsg+0x30/0x30\n[  279.921423]  ? __copy_msghdr+0x3c0/0x3c0\n[  279.922254]  ? import_iovec+0x7/0x10\n[  279.923041]  ___sys_sendmsg+0xeb/0x170\n[  279.923854]  ? copy_msghdr_from_user+0x110/0x110\n[  279.924797]  ? ___sys_recvmsg+0xd9/0x130\n[  279.925630]  ? __perf_event_task_sched_in+0x183/0x470\n[  279.926656]  ? ___sys_sendmsg+0x170/0x170\n[  279.927529]  ? ctx_sched_in+0x530/0x530\n[  279.928369]  ? update_curr+0x283/0x4f0\n[  279.929185]  ? perf_event_update_userpage+0x570/0x570\n[  279.930201]  ? __fget_light+0x57/0x520\n[  279.931023]  ? __switch_to+0x53d/0xe70\n[  27\n---truncated---"
          }
        ],
        "id": "CVE-2023-54193",
        "lastModified": "2026-10-15T22:17:54.440",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 7.8,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 1.8,
              "impactScore": 5.9,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
            }
          ],
          "ssvcV203": [
            {
              "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "ssvcData": {
                "id": "CVE-2023-54193",
                "options": [
                  {
                    "exploitation": "none"
                  },
                  {
                    "automatable": "no"
                  },
                  {
                    "technicalImpact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-10-15T21:38:55.488795Z",
                "version": "2.0.3"
              }
            }
          ]
        },
        "published": "2025-12-30T13:16:07.320",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/26aec72429a05e917d574eca0efc5306c63a8862"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/55866fe3fded3ce94ac3fc1bb3dfce654282f483"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/7311c8be3755611bf6edea4dfbeb190b4bdd489f"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/7b7a74ed303d532fb73ae4b1697f16a0fea89cd0"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/cb145932fcf6814e7e95e467eb70e7849a845ae9"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/cc5fe387c6294d0471cb7ed064efac97fac65ccc"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/da94a7781fc3c92e7df7832bc2746f4d39bc624e"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Deferred"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-04T19:13:58+00:00",
      "cve": "CVE-2023-54193",
      "id": "CVE-2023-54193",
      "initial_release_date": "2023-01-01T00:00:00+00:00",
      "product_status:known_affected": "170",
      "product_status:known_not_affected": "104",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net/sched: cls_api: remove block_cb from driver_list before freeing",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2023/cve-2023-54193.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-10-16T13:20:29Z",
      "cve": "CVE-2023-54193",
      "id": "CVE-2023-54193",
      "initial_release_date": "2025-12-31T00:28:49Z",
      "product_status:known_affected": "201",
      "product_status:known_not_affected": "356",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2023-54193",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/2025/cve-2023-54193.json",
      "version": "13"
    },
    "vulnrichment": {
      "containers": {
        "adp": [
          {
            "metrics": [
              {
                "other": {
                  "content": {
                    "id": "CVE-2023-54193",
                    "options": [
                      {
                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "no"
                      },
                      {
                        "Technical Impact": "total"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2026-10-15T21:38:55.488795Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2026-10-15T21:38:56.327Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "defaultStatus": "unaffected",
              "product": "Linux",
              "programFiles": [
                "net/sched/cls_api.c"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "lessThan": "cc5fe387c6294d0471cb7ed064efac97fac65ccc",
                  "status": "affected",
                  "version": "59094b1e5094c7e50a3d2912202fd30b6a1dadf8",
                  "versionType": "git"
                },
                {
                  "lessThan": "7311c8be3755611bf6edea4dfbeb190b4bdd489f",
                  "status": "affected",
                  "version": "59094b1e5094c7e50a3d2912202fd30b6a1dadf8",
                  "versionType": "git"
                },
                {
                  "lessThan": "cb145932fcf6814e7e95e467eb70e7849a845ae9",
                  "status": "affected",
                  "version": "59094b1e5094c7e50a3d2912202fd30b6a1dadf8",
                  "versionType": "git"
                },
                {
                  "lessThan": "55866fe3fded3ce94ac3fc1bb3dfce654282f483",
                  "status": "affected",
                  "version": "59094b1e5094c7e50a3d2912202fd30b6a1dadf8",
                  "versionType": "git"
                },
                {
                  "lessThan": "26aec72429a05e917d574eca0efc5306c63a8862",
                  "status": "affected",
                  "version": "59094b1e5094c7e50a3d2912202fd30b6a1dadf8",
                  "versionType": "git"
                },
                {
                  "lessThan": "7b7a74ed303d532fb73ae4b1697f16a0fea89cd0",
                  "status": "affected",
                  "version": "59094b1e5094c7e50a3d2912202fd30b6a1dadf8",
                  "versionType": "git"
                },
                {
                  "lessThan": "da94a7781fc3c92e7df7832bc2746f4d39bc624e",
                  "status": "affected",
                  "version": "59094b1e5094c7e50a3d2912202fd30b6a1dadf8",
                  "versionType": "git"
                }
              ]
            },
            {
              "defaultStatus": "affected",
              "product": "Linux",
              "programFiles": [
                "net/sched/cls_api.c"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "status": "affected",
                  "version": "5.3"
                },
                {
                  "lessThan": "5.3",
                  "status": "unaffected",
                  "version": "0",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.4.*",
                  "status": "unaffected",
                  "version": "5.4.243",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.10.*",
                  "status": "unaffected",
                  "version": "5.10.180",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.15.*",
                  "status": "unaffected",
                  "version": "5.15.112",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.1.*",
                  "status": "unaffected",
                  "version": "6.1.29",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.2.*",
                  "status": "unaffected",
                  "version": "6.2.16",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.3.*",
                  "status": "unaffected",
                  "version": "6.3.3",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "*",
                  "status": "unaffected",
                  "version": "6.4",
                  "versionType": "original_commit_for_fix"
                }
              ]
            }
          ],
          "cpeApplicability": [
            {
              "nodes": [
                {
                  "cpeMatch": [
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.4.243",
                      "versionStartIncluding": "5.3",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.10.180",
                      "versionStartIncluding": "5.3",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.15.112",
                      "versionStartIncluding": "5.3",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.1.29",
                      "versionStartIncluding": "5.3",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.2.16",
                      "versionStartIncluding": "5.3",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.3.3",
                      "versionStartIncluding": "5.3",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.4",
                      "versionStartIncluding": "5.3",
                      "vulnerable": true
                    }
                  ],
                  "negate": false,
                  "operator": "OR"
                }
              ]
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: cls_api: remove block_cb from driver_list before freeing\n\nError handler of tcf_block_bind() frees the whole bo-\u003ecb_list on error.\nHowever, by that time the flow_block_cb instances are already in the driver\nlist because driver ndo_setup_tc() callback is called before that up the\ncall chain in tcf_block_offload_cmd(). This leaves dangling pointers to\nfreed objects in the list and causes use-after-free[0]. Fix it by also\nremoving flow_block_cb instances from driver_list before deallocating them.\n\n[0]:\n[  279.868433] ==================================================================\n[  279.869964] BUG: KASAN: slab-use-after-free in flow_block_cb_setup_simple+0x631/0x7c0\n[  279.871527] Read of size 8 at addr ffff888147e2bf20 by task tc/2963\n\n[  279.873151] CPU: 6 PID: 2963 Comm: tc Not tainted 6.3.0-rc6+ #4\n[  279.874273] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.13.0-0-gf21b5a4aeb02-prebuilt.qemu.org 04/01/2014\n[  279.876295] Call Trace:\n[  279.876882]  \u003cTASK\u003e\n[  279.877413]  dump_stack_lvl+0x33/0x50\n[  279.878198]  print_report+0xc2/0x610\n[  279.878987]  ? flow_block_cb_setup_simple+0x631/0x7c0\n[  279.879994]  kasan_report+0xae/0xe0\n[  279.880750]  ? flow_block_cb_setup_simple+0x631/0x7c0\n[  279.881744]  ? mlx5e_tc_reoffload_flows_work+0x240/0x240 [mlx5_core]\n[  279.883047]  flow_block_cb_setup_simple+0x631/0x7c0\n[  279.884027]  tcf_block_offload_cmd.isra.0+0x189/0x2d0\n[  279.885037]  ? tcf_block_setup+0x6b0/0x6b0\n[  279.885901]  ? mutex_lock+0x7d/0xd0\n[  279.886669]  ? __mutex_unlock_slowpath.constprop.0+0x2d0/0x2d0\n[  279.887844]  ? ingress_init+0x1c0/0x1c0 [sch_ingress]\n[  279.888846]  tcf_block_get_ext+0x61c/0x1200\n[  279.889711]  ingress_init+0x112/0x1c0 [sch_ingress]\n[  279.890682]  ? clsact_init+0x2b0/0x2b0 [sch_ingress]\n[  279.891701]  qdisc_create+0x401/0xea0\n[  279.892485]  ? qdisc_tree_reduce_backlog+0x470/0x470\n[  279.893473]  tc_modify_qdisc+0x6f7/0x16d0\n[  279.894344]  ? tc_get_qdisc+0xac0/0xac0\n[  279.895213]  ? mutex_lock+0x7d/0xd0\n[  279.896005]  ? __mutex_lock_slowpath+0x10/0x10\n[  279.896910]  rtnetlink_rcv_msg+0x5fe/0x9d0\n[  279.897770]  ? rtnl_calcit.isra.0+0x2b0/0x2b0\n[  279.898672]  ? __sys_sendmsg+0xb5/0x140\n[  279.899494]  ? do_syscall_64+0x3d/0x90\n[  279.900302]  ? entry_SYSCALL_64_after_hwframe+0x46/0xb0\n[  279.901337]  ? kasan_save_stack+0x2e/0x40\n[  279.902177]  ? kasan_save_stack+0x1e/0x40\n[  279.903058]  ? kasan_set_track+0x21/0x30\n[  279.903913]  ? kasan_save_free_info+0x2a/0x40\n[  279.904836]  ? ____kasan_slab_free+0x11a/0x1b0\n[  279.905741]  ? kmem_cache_free+0x179/0x400\n[  279.906599]  netlink_rcv_skb+0x12c/0x360\n[  279.907450]  ? rtnl_calcit.isra.0+0x2b0/0x2b0\n[  279.908360]  ? netlink_ack+0x1550/0x1550\n[  279.909192]  ? rhashtable_walk_peek+0x170/0x170\n[  279.910135]  ? kmem_cache_alloc_node+0x1af/0x390\n[  279.911086]  ? _copy_from_iter+0x3d6/0xc70\n[  279.912031]  netlink_unicast+0x553/0x790\n[  279.912864]  ? netlink_attachskb+0x6a0/0x6a0\n[  279.913763]  ? netlink_recvmsg+0x416/0xb50\n[  279.914627]  netlink_sendmsg+0x7a1/0xcb0\n[  279.915473]  ? netlink_unicast+0x790/0x790\n[  279.916334]  ? iovec_from_user.part.0+0x4d/0x220\n[  279.917293]  ? netlink_unicast+0x790/0x790\n[  279.918159]  sock_sendmsg+0xc5/0x190\n[  279.918938]  ____sys_sendmsg+0x535/0x6b0\n[  279.919813]  ? import_iovec+0x7/0x10\n[  279.920601]  ? kernel_sendmsg+0x30/0x30\n[  279.921423]  ? __copy_msghdr+0x3c0/0x3c0\n[  279.922254]  ? import_iovec+0x7/0x10\n[  279.923041]  ___sys_sendmsg+0xeb/0x170\n[  279.923854]  ? copy_msghdr_from_user+0x110/0x110\n[  279.924797]  ? ___sys_recvmsg+0xd9/0x130\n[  279.925630]  ? __perf_event_task_sched_in+0x183/0x470\n[  279.926656]  ? ___sys_sendmsg+0x170/0x170\n[  279.927529]  ? ctx_sched_in+0x530/0x530\n[  279.928369]  ? update_curr+0x283/0x4f0\n[  279.929185]  ? perf_event_update_userpage+0x570/0x570\n[  279.930201]  ? __fget_light+0x57/0x520\n[  279.931023]  ? __switch_to+0x53d/0xe70\n[  27\n---truncated---"
            }
          ],
          "metrics": [
            {
              "cvssV3_1": {
                "baseScore": 7.8,
                "baseSeverity": "HIGH",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "scenarios": [
                {
                  "lang": "en",
                  "value": "AV:L - The vulnerability is reached through the tc/rtnetlink qdisc-configuration path (RTM_NEWQDISC via netlink sendmsg), which requires local system access, not a network peer.\nAC:L - The attacker controls every tc operation needed to set up the failing reoffload and trigger the error path, and there is no uncontrolled race; on a common offload-capable NIC the sequence is reliably reproducible.\nPR:L - Configuring tc qdiscs/blocks requires CAP_NET_ADMIN, which an unprivileged local user can obtain in a new network namespace via unshare -Urn, so only low privilege is needed.\nUI:N - The entire sequence is driven by the attacker\u0027s own netlink/tc operations with no victim interaction required.\nS:U - The use-after-free corrupts kernel data within the same kernel security authority; no crossing of a VM/IOMMU/sandbox boundary occurs.\nC:H - The dangling driver_list pointer references a freed kmalloc-192 object whose contents can be attacker-controlled via heap spraying, enabling disclosure of kernel memory.\nI:H - A use-after-free of a reclaimable heap object provides a write/type-confusion primitive that can be leveraged toward arbitrary memory modification and control-flow hijacking.\nA:H - The use-after-free reliably causes kernel oops/panic (as shown by the KASAN report), resulting in denial of service."
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-08-05T09:17:56.124Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "references": [
            {
              "url": "https://git.kernel.org/stable/c/cc5fe387c6294d0471cb7ed064efac97fac65ccc"
            },
            {
              "url": "https://git.kernel.org/stable/c/7311c8be3755611bf6edea4dfbeb190b4bdd489f"
            },
            {
              "url": "https://git.kernel.org/stable/c/cb145932fcf6814e7e95e467eb70e7849a845ae9"
            },
            {
              "url": "https://git.kernel.org/stable/c/55866fe3fded3ce94ac3fc1bb3dfce654282f483"
            },
            {
              "url": "https://git.kernel.org/stable/c/26aec72429a05e917d574eca0efc5306c63a8862"
            },
            {
              "url": "https://git.kernel.org/stable/c/7b7a74ed303d532fb73ae4b1697f16a0fea89cd0"
            },
            {
              "url": "https://git.kernel.org/stable/c/da94a7781fc3c92e7df7832bc2746f4d39bc624e"
            }
          ],
          "title": "net/sched: cls_api: remove block_cb from driver_list before freeing",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2023-54193",
        "datePublished": "2025-12-30T12:09:00.738Z",
        "dateReserved": "2025-12-30T12:06:44.498Z",
        "dateUpdated": "2026-10-15T21:41:40.994Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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