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EUVD-2026-367594

European Vulnerability Database identifier assigned by ENISA

Reserved

2026-10-02 08:36

Assigner

ENISA

Alias of

a CVE record, shown under related vulnerabilities. This identifier carries no description, severity or references of its own: they belong to that CVE.

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{
  "assigner": "ENISA",
  "date_reserved": "2026-10-02T08:36:27.857370+00:00",
  "id": "EUVD-2026-367594"
}

CVE-2026-89483 (GCVE-0-2026-89483)

Vulnerability from cvelistv5 – Published: 2026-09-11 19:43 – Updated: 2026-09-14 12:00

Title

nvme: zero the discard fallback page

Summary

In the Linux kernel, the following vulnerability has been resolved: nvme: zero the discard fallback page nvme_setup_discard() always maps sizeof(struct nvme_dsm_range) * NVME_DSM_MAX_RANGES = 4096 bytes as the DSM payload however many ranges the command declares, because some devices ignore the 'Number of Ranges' field - the Fixes: commit records two that read past the declared ranges. A single-range discard fills only the first 16 bytes. Normally the buffer comes from kzalloc() and the other 4080 bytes are zero. When that allocation fails the code falls back to the per-controller ctrl->discard_page, which nvme_init_ctrl() obtains with alloc_page(GFP_KERNEL) and nothing ever zeroes, so those 4080 bytes are whatever the page last held and are handed to the controller. Reaching it requires the kzalloc(GFP_ATOMIC | __GFP_NOWARN) to fail, that is memory pressure; it is not remotely triggerable. Failing the allocation under KMSAN reproduces it, with the leaked tail full of vmemmap struct page pointers. The extent in the report is a partial transfer of the payload, not the whole 4096 bytes; the 16-byte boundary in it is the one declared range: [ 11.991601] BUG: KMSAN: uninit-value in dma_map_phys+0x14c8/0x1900 [ 11.991969] dma_map_phys+0x14c8/0x1900 [ 11.992220] dma_map_page_attrs+0xcf/0x130 [ 11.992485] e1000_xmit_frame+0x4099/0x6d10 [ 11.992768] dev_hard_start_xmit+0x22f/0xa80 [ 11.993068] sch_direct_xmit+0x35c/0xcb0 [ 11.993315] __dev_queue_xmit+0x1ee5/0x5eb0 [ 11.993608] ip_finish_output2+0x1903/0x1c30 [ 11.993881] ip_finish_output+0x288/0x870 [ 11.994125] ip_output+0x15e/0x400 [ 11.994365] __ip_queue_xmit+0x1e85/0x1fb0 [ 11.994639] ip_queue_xmit+0x60/0x80 [ 11.994899] __tcp_transmit_skb+0x4e71/0x5fa0 [ 11.995210] tcp_write_xmit+0x3a36/0x9160 [ 11.995533] __tcp_push_pending_frames+0xc5/0x3c0 [ 11.995854] tcp_push+0x7dc/0x840 [ 11.996076] tcp_sendmsg_locked+0x766c/0x8400 [ 11.996371] tcp_sendmsg+0x4b/0x90 [ 11.996572] inet_sendmsg+0x134/0x2a0 [ 11.996823] __sock_sendmsg+0x265/0x360 [ 11.997076] sock_sendmsg+0x100/0x1e0 [ 11.997293] nvme_tcp_try_send+0x196f/0x6370 [ 11.997605] nvme_tcp_queue_rq+0x1d54/0x20b0 [ 11.997882] blk_mq_dispatch_rq_list+0x5ee/0x2e50 [ 11.998175] __blk_mq_sched_dispatch_requests+0x16dc/0x24a0 [ 11.998539] blk_mq_sched_dispatch_requests+0x11b/0x2c0 [ 11.998865] blk_mq_run_work_fn+0x13b/0x280 [ 11.999146] process_scheduled_works+0x966/0x1ad0 [ 11.999465] worker_thread+0xe44/0x1480 [ 11.999709] kthread+0x53b/0x600 [ 11.999927] ret_from_fork+0x29f/0x7c0 [ 12.000191] ret_from_fork_asm+0x1a/0x30 [ 12.000460] [ 12.000558] Uninit was created at: [ 12.000788] __alloc_frozen_pages_noprof+0x8bf/0xd30 [ 12.001096] alloc_pages_mpol+0x1d0/0x5f0 [ 12.001326] alloc_pages_noprof+0x102/0x290 [ 12.001627] nvme_init_ctrl+0x5a3/0x9f0 [ 12.001891] nvme_tcp_create_ctrl+0xd75/0x19b0 [ 12.002170] nvmf_dev_write+0x4c68/0x4fd0 [ 12.002426] vfs_write+0x587/0x1a10 [ 12.002636] __x64_sys_write+0x207/0x4f0 [ 12.002874] x64_sys_call+0x2ff0/0x3ea0 [ 12.003123] do_syscall_64+0x147/0x3b0 [ 12.003400] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 12.003680] [ 12.003777] Bytes 16-2843 of 2844 are uninitialized [ 12.004068] Memory access of size 2844 starts at ffff888109f82000 [ 12.004412] [ 12.004530] CPU: 0 UID: 0 PID: 101 Comm: kworker/0:1H Not tainted 7.2.0-rc5-NVMECTL-gf5098b6bae76 #1 PREEMPT(lazy) [ 12.005127] Hardware name: QEMU Ubuntu 24.04 PC v2 (i440FX + PIIX, arch_caps fix, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 12.005762] Workqueue: kblockd blk_mq_run_work_fn [ 12.006073] ===================================================== Allocate the page with __GFP_ZERO. The single allocation site covers every use of it: bytes no discard has written stay zero, and bytes one did write hold that controller's own range list, which it has already been sent.

Severity

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Assigner

Linux mitre root Scorecard

References

8 references

URL	Tags
https://git.kernel.org/stable/c/76139b5bbf531e675…
https://git.kernel.org/stable/c/3f84d2bd0d8ae8c7e…
https://git.kernel.org/stable/c/415f2772ebcbc7f3f…
https://git.kernel.org/stable/c/66b5af23b6f956e57…
https://git.kernel.org/stable/c/dc4d4b70a863f7e39…
https://git.kernel.org/stable/c/67551d8430df94c82…
https://git.kernel.org/stable/c/f5827817b4fc7feea…
https://git.kernel.org/stable/c/bededeaaeff404978…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 530436c45ef2e446c12538a400e465929a0b3ade , < 76139b5bbf531e675934b97227be3521c7fdd537 (git) Affected: 530436c45ef2e446c12538a400e465929a0b3ade , < 3f84d2bd0d8ae8c7e8e0f8fc3cbf018a282971a1 (git) Affected: 530436c45ef2e446c12538a400e465929a0b3ade , < 415f2772ebcbc7f3f1ab1a71915dab82cee3465e (git) Affected: 530436c45ef2e446c12538a400e465929a0b3ade , < 66b5af23b6f956e57f8205c46aa80b054631be34 (git) Affected: 530436c45ef2e446c12538a400e465929a0b3ade , < dc4d4b70a863f7e39ef8bd137634be4e6db8b084 (git) Affected: 530436c45ef2e446c12538a400e465929a0b3ade , < 67551d8430df94c827e1830bd3a5fae1f66a5219 (git) Affected: 530436c45ef2e446c12538a400e465929a0b3ade , < f5827817b4fc7feeabf4f53fb4b626e6edc52fef (git) Affected: 530436c45ef2e446c12538a400e465929a0b3ade , < bededeaaeff404978a5a8e2a605a6c3017cddd3e (git) Affected: ffa56cbdd2409b522b4cb56461bea1c45889417b (git) Affected: 8b0acb768a06083b0d28bace1481c1f6679e76f4 (git) Affected: 4.19.92 , < 4.20 (semver) Affected: 5.4.7 , < 5.5 (semver)
Linux	Linux	Affected: 5.5 Unaffected: 0 , < 5.5 (semver) Unaffected: 5.10.270 , ≤ 5.10.* (semver) Unaffected: 5.15.221 , ≤ 5.15.* (semver) Unaffected: 6.1.188 , ≤ 6.1.* (semver) Unaffected: 6.6.157 , ≤ 6.6.* (semver) Unaffected: 6.12.109 , ≤ 6.12.* (semver) Unaffected: 6.18.50 , ≤ 6.18.* (semver) Unaffected: 7.2.4 , ≤ 7.2.* (semver) Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/nvme/host/core.c"
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          "vendor": "Linux",
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            },
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              "versionType": "git"
            },
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              "status": "affected",
              "version": "4.19.92",
              "versionType": "semver"
            },
            {
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              "status": "affected",
              "version": "5.4.7",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/nvme/host/core.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.5"
            },
            {
              "lessThan": "5.5",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
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              "status": "unaffected",
              "version": "5.10.270",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.221",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.188",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.157",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.109",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.50",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.270",
                  "versionStartIncluding": "5.5",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.221",
                  "versionStartIncluding": "5.5",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.188",
                  "versionStartIncluding": "5.5",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.157",
                  "versionStartIncluding": "5.5",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.109",
                  "versionStartIncluding": "5.5",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.50",
                  "versionStartIncluding": "5.5",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.4",
                  "versionStartIncluding": "5.5",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3-rc1",
                  "versionStartIncluding": "5.5",
                  "vulnerable": true
                },
                {
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                  "versionStartIncluding": "4.19.92",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "5.4.7",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnvme: zero the discard fallback page\n\nnvme_setup_discard() always maps sizeof(struct nvme_dsm_range) *\nNVME_DSM_MAX_RANGES = 4096 bytes as the DSM payload however many ranges\nthe command declares, because some devices ignore the \u0027Number of Ranges\u0027\nfield - the Fixes: commit records two that read past the declared ranges.\nA single-range discard fills only the first 16 bytes.\n\nNormally the buffer comes from kzalloc() and the other 4080 bytes are\nzero.  When that allocation fails the code falls back to the\nper-controller ctrl-\u003ediscard_page, which nvme_init_ctrl() obtains with\nalloc_page(GFP_KERNEL) and nothing ever zeroes, so those 4080 bytes are\nwhatever the page last held and are handed to the controller.  Reaching\nit requires the kzalloc(GFP_ATOMIC | __GFP_NOWARN) to fail, that is\nmemory pressure; it is not remotely triggerable.  Failing the allocation\nunder KMSAN reproduces it, with the leaked tail full of vmemmap struct\npage pointers.  The extent in the report is a partial transfer of the\npayload, not the whole 4096 bytes; the 16-byte boundary in it is the one\ndeclared range:\n\n[   11.991601] BUG: KMSAN: uninit-value in dma_map_phys+0x14c8/0x1900\n[   11.991969]  dma_map_phys+0x14c8/0x1900\n[   11.992220]  dma_map_page_attrs+0xcf/0x130\n[   11.992485]  e1000_xmit_frame+0x4099/0x6d10\n[   11.992768]  dev_hard_start_xmit+0x22f/0xa80\n[   11.993068]  sch_direct_xmit+0x35c/0xcb0\n[   11.993315]  __dev_queue_xmit+0x1ee5/0x5eb0\n[   11.993608]  ip_finish_output2+0x1903/0x1c30\n[   11.993881]  ip_finish_output+0x288/0x870\n[   11.994125]  ip_output+0x15e/0x400\n[   11.994365]  __ip_queue_xmit+0x1e85/0x1fb0\n[   11.994639]  ip_queue_xmit+0x60/0x80\n[   11.994899]  __tcp_transmit_skb+0x4e71/0x5fa0\n[   11.995210]  tcp_write_xmit+0x3a36/0x9160\n[   11.995533]  __tcp_push_pending_frames+0xc5/0x3c0\n[   11.995854]  tcp_push+0x7dc/0x840\n[   11.996076]  tcp_sendmsg_locked+0x766c/0x8400\n[   11.996371]  tcp_sendmsg+0x4b/0x90\n[   11.996572]  inet_sendmsg+0x134/0x2a0\n[   11.996823]  __sock_sendmsg+0x265/0x360\n[   11.997076]  sock_sendmsg+0x100/0x1e0\n[   11.997293]  nvme_tcp_try_send+0x196f/0x6370\n[   11.997605]  nvme_tcp_queue_rq+0x1d54/0x20b0\n[   11.997882]  blk_mq_dispatch_rq_list+0x5ee/0x2e50\n[   11.998175]  __blk_mq_sched_dispatch_requests+0x16dc/0x24a0\n[   11.998539]  blk_mq_sched_dispatch_requests+0x11b/0x2c0\n[   11.998865]  blk_mq_run_work_fn+0x13b/0x280\n[   11.999146]  process_scheduled_works+0x966/0x1ad0\n[   11.999465]  worker_thread+0xe44/0x1480\n[   11.999709]  kthread+0x53b/0x600\n[   11.999927]  ret_from_fork+0x29f/0x7c0\n[   12.000191]  ret_from_fork_asm+0x1a/0x30\n[   12.000460]\n[   12.000558] Uninit was created at:\n[   12.000788]  __alloc_frozen_pages_noprof+0x8bf/0xd30\n[   12.001096]  alloc_pages_mpol+0x1d0/0x5f0\n[   12.001326]  alloc_pages_noprof+0x102/0x290\n[   12.001627]  nvme_init_ctrl+0x5a3/0x9f0\n[   12.001891]  nvme_tcp_create_ctrl+0xd75/0x19b0\n[   12.002170]  nvmf_dev_write+0x4c68/0x4fd0\n[   12.002426]  vfs_write+0x587/0x1a10\n[   12.002636]  __x64_sys_write+0x207/0x4f0\n[   12.002874]  x64_sys_call+0x2ff0/0x3ea0\n[   12.003123]  do_syscall_64+0x147/0x3b0\n[   12.003400]  entry_SYSCALL_64_after_hwframe+0x77/0x7f\n[   12.003680]\n[   12.003777] Bytes 16-2843 of 2844 are uninitialized\n[   12.004068] Memory access of size 2844 starts at ffff888109f82000\n[   12.004412]\n[   12.004530] CPU: 0 UID: 0 PID: 101 Comm: kworker/0:1H Not tainted 7.2.0-rc5-NVMECTL-gf5098b6bae76 #1 PREEMPT(lazy)\n[   12.005127] Hardware name: QEMU Ubuntu 24.04 PC v2 (i440FX + PIIX, arch_caps fix, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014\n[   12.005762] Workqueue: kblockd blk_mq_run_work_fn\n[   12.006073] =====================================================\n\nAllocate the page with __GFP_ZERO.  The single allocation site covers\nevery use of it: bytes no discard has written stay zero, and bytes one\ndid write hold that controller\u0027s own range list, which it has already\nbeen sent."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - nvme_setup_discard() DMA-maps a 4096-byte DSM buffer that nvme-tcp (KMSAN: nvme_tcp_try_send), nvme-rdma, and nvme-fc transmit to the remote controller, so a malicious NVMe-oF target on the storage fabric receives the leftover kernel page.\nAC:L - The fallback is used when kzalloc(GFP_ATOMIC|__GFP_NOWARN) fails; a fabric peer can drive watermarks with high queue-depth I/O while discards run and retry until discard_page is used, with no race or unknown layout required.\nPR:N - A compromised NVMe-oF target needs no Linux account or capability on the initiator; once the host is attached to fabric storage, DSM payloads are sent without further local authorization.\nUI:N - REQ_OP_DISCARD is issued automatically by mount-discard, fstrim timers, hole-punch, and thin-provision UNMAP during normal operation once an NVMe controller exists; no extra victim mount or click is required at exploit time.\nS:U - The disclosure is host kernel memory to the NVMe controller/peer within the same kernel authority and is not a VM escape, IOMMU bypass, or other cross-boundary scope change.\nC:H - nvme_init_ctrl() allocated discard_page with alloc_page(GFP_KERNEL) and no __GFP_ZERO, so up to 4080 bytes of stale buddy-page contents (KMSAN showed kernel/vmemmap pointers) are sent in the DSM payload, a page-sized leak rather than a few bounded bytes.\nI:N - The flaw only transmits leftover page bytes to the controller; it does not overwrite kernel objects, provide a write primitive, or enable control-flow hijacking.\nA:N - DMA/send of the uninitialized DSM padding completes without oops, panic, or hang; the KMSAN uninit-value report is a sanitizer finding on the transmit path, not a host denial of service."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-14T12:00:20.304Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/76139b5bbf531e675934b97227be3521c7fdd537"
        },
        {
          "url": "https://git.kernel.org/stable/c/3f84d2bd0d8ae8c7e8e0f8fc3cbf018a282971a1"
        },
        {
          "url": "https://git.kernel.org/stable/c/415f2772ebcbc7f3f1ab1a71915dab82cee3465e"
        },
        {
          "url": "https://git.kernel.org/stable/c/66b5af23b6f956e57f8205c46aa80b054631be34"
        },
        {
          "url": "https://git.kernel.org/stable/c/dc4d4b70a863f7e39ef8bd137634be4e6db8b084"
        },
        {
          "url": "https://git.kernel.org/stable/c/67551d8430df94c827e1830bd3a5fae1f66a5219"
        },
        {
          "url": "https://git.kernel.org/stable/c/f5827817b4fc7feeabf4f53fb4b626e6edc52fef"
        },
        {
          "url": "https://git.kernel.org/stable/c/bededeaaeff404978a5a8e2a605a6c3017cddd3e"
        }
      ],
      "title": "nvme: zero the discard fallback page",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-89483",
    "datePublished": "2026-09-11T19:43:38.076Z",
    "dateReserved": "2026-09-11T19:38:34.712Z",
    "dateUpdated": "2026-09-14T12:00:20.304Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

EUVD-2026-367594

CVE-2026-89483 (GCVE-0-2026-89483)

Tags

Sightings

Nomenclature

Related by attack behaviour