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EUVD-2026-345338

European Vulnerability Database identifier assigned by ENISA

Reserved

2026-10-02 08:01

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": "2026-10-02T08:01:17.221696+00:00",
  "id": "EUVD-2026-345338"
}

CVE-2023-53862 (GCVE-0-2023-53862)

Vulnerability from cvelistv5 – Published: 2025-12-09 01:30 – Updated: 2026-08-05 09:16

Title

hfs: fix missing hfs_bnode_get() in __hfs_bnode_create

Summary

In the Linux kernel, the following vulnerability has been resolved: hfs: fix missing hfs_bnode_get() in __hfs_bnode_create Syzbot found a kernel BUG in hfs_bnode_put(): kernel BUG at fs/hfs/bnode.c:466! invalid opcode: 0000 [#1] PREEMPT SMP KASAN CPU: 0 PID: 3634 Comm: kworker/u4:5 Not tainted 6.1.0-rc7-syzkaller-00190-g97ee9d1c1696 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 Workqueue: writeback wb_workfn (flush-7:0) RIP: 0010:hfs_bnode_put+0x46f/0x480 fs/hfs/bnode.c:466 Code: 8a 80 ff e9 73 fe ff ff 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c a0 fe ff ff 48 89 df e8 db 8a 80 ff e9 93 fe ff ff e8 a1 68 2c ff <0f> 0b e8 9a 68 2c ff 0f 0b 0f 1f 84 00 00 00 00 00 55 41 57 41 56 RSP: 0018:ffffc90003b4f258 EFLAGS: 00010293 RAX: ffffffff825e318f RBX: 0000000000000000 RCX: ffff8880739dd7c0 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc90003b4f430 R08: ffffffff825e2d9b R09: ffffed10045157d1 R10: ffffed10045157d1 R11: 1ffff110045157d0 R12: ffff8880228abe80 R13: ffff88807016c000 R14: dffffc0000000000 R15: ffff8880228abe00 FS: 0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fa6ebe88718 CR3: 000000001e93d000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> hfs_write_inode+0x1bc/0xb40 write_inode fs/fs-writeback.c:1440 [inline] __writeback_single_inode+0x4d6/0x670 fs/fs-writeback.c:1652 writeback_sb_inodes+0xb3b/0x18f0 fs/fs-writeback.c:1878 __writeback_inodes_wb+0x125/0x420 fs/fs-writeback.c:1949 wb_writeback+0x440/0x7b0 fs/fs-writeback.c:2054 wb_check_start_all fs/fs-writeback.c:2176 [inline] wb_do_writeback fs/fs-writeback.c:2202 [inline] wb_workfn+0x827/0xef0 fs/fs-writeback.c:2235 process_one_work+0x877/0xdb0 kernel/workqueue.c:2289 worker_thread+0xb14/0x1330 kernel/workqueue.c:2436 kthread+0x266/0x300 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 </TASK> The BUG_ON() is triggered at here: /* Dispose of resources used by a node */ void hfs_bnode_put(struct hfs_bnode *node) { if (node) { <skipped> BUG_ON(!atomic_read(&node->refcnt)); <- we have issue here!!!! <skipped> } } By tracing the refcnt, I found the node is created by hfs_bmap_alloc() with refcnt 1. Then the node is used by hfs_btree_write(). There is a missing of hfs_bnode_get() after find the node. The issue happened in following path: <alloc> hfs_bmap_alloc hfs_bnode_find __hfs_bnode_create <- allocate a new node with refcnt 1. hfs_bnode_put <- decrease the refcnt <write> hfs_btree_write hfs_bnode_find __hfs_bnode_create hfs_bnode_findhash <- find the node without refcnt increased. hfs_bnode_put <- trigger the BUG_ON() since refcnt is 0.

Severity

7.8 (High)


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

Assigner

Linux mitre root Scorecard

References

8 references

URL	Tags
https://git.kernel.org/stable/c/062af3e9930762d1f…
https://git.kernel.org/stable/c/3a9065a33988c0278…
https://git.kernel.org/stable/c/eda6879272e4df545…
https://git.kernel.org/stable/c/dc9f78b6d254427a0…
https://git.kernel.org/stable/c/2cab8db14566cf6a5…
https://git.kernel.org/stable/c/8140cdc57bc5844cd…
https://git.kernel.org/stable/c/38d72e6604b9f96df…
https://git.kernel.org/stable/c/a9dc087fd3c484fd1…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 062af3e9930762d1fd22946748d34e0d859e4a8e (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 3a9065a33988c02789722be612f7c42fb8ebbb22 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < eda6879272e4df5456afc36642052ea066f58410 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < dc9f78b6d254427a06e568f2887b1011ef3143ef (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 2cab8db14566cf6a516c1f103a60cf6b7f54b1e5 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 8140cdc57bc5844cd5e1392673ec2dbf8fdc6940 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 38d72e6604b9f96dffcc0565090cc01622a37b2a (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < a9dc087fd3c484fd1ed18c5efb290efaaf44ce03 (git)
Linux	Linux	Affected: 2.6.12 Unaffected: 0 , < 2.6.12 (semver) Unaffected: 4.14.308 , ≤ 4.14.* (semver) Unaffected: 4.19.276 , ≤ 4.19.* (semver) Unaffected: 5.4.235 , ≤ 5.4.* (semver) Unaffected: 5.10.173 , ≤ 5.10.* (semver) Unaffected: 5.15.99 , ≤ 5.15.* (semver) Unaffected: 6.1.16 , ≤ 6.1.* (semver) Unaffected: 6.2.3 , ≤ 6.2.* (semver) Unaffected: 6.3 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/hfs/bnode.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "062af3e9930762d1fd22946748d34e0d859e4a8e",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            },
            {
              "lessThan": "3a9065a33988c02789722be612f7c42fb8ebbb22",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            },
            {
              "lessThan": "eda6879272e4df5456afc36642052ea066f58410",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            },
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              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            },
            {
              "lessThan": "2cab8db14566cf6a516c1f103a60cf6b7f54b1e5",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            },
            {
              "lessThan": "8140cdc57bc5844cd5e1392673ec2dbf8fdc6940",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            },
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              "status": "affected",
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              "versionType": "git"
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              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
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          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.12"
            },
            {
              "lessThan": "2.6.12",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "4.14.*",
              "status": "unaffected",
              "version": "4.14.308",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "4.19.*",
              "status": "unaffected",
              "version": "4.19.276",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.4.*",
              "status": "unaffected",
              "version": "5.4.235",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.173",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.99",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.16",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.2.*",
              "status": "unaffected",
              "version": "6.2.3",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "4.14.308",
                  "versionStartIncluding": "2.6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "4.19.276",
                  "versionStartIncluding": "2.6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.4.235",
                  "versionStartIncluding": "2.6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.173",
                  "versionStartIncluding": "2.6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.99",
                  "versionStartIncluding": "2.6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.16",
                  "versionStartIncluding": "2.6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.2.3",
                  "versionStartIncluding": "2.6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.3",
                  "versionStartIncluding": "2.6.12",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nhfs: fix missing hfs_bnode_get() in __hfs_bnode_create\n\nSyzbot found a kernel BUG in hfs_bnode_put():\n\n kernel BUG at fs/hfs/bnode.c:466!\n invalid opcode: 0000 [#1] PREEMPT SMP KASAN\n CPU: 0 PID: 3634 Comm: kworker/u4:5 Not tainted 6.1.0-rc7-syzkaller-00190-g97ee9d1c1696 #0\n Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022\n Workqueue: writeback wb_workfn (flush-7:0)\n RIP: 0010:hfs_bnode_put+0x46f/0x480 fs/hfs/bnode.c:466\n Code: 8a 80 ff e9 73 fe ff ff 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c a0 fe ff ff 48 89 df e8 db 8a 80 ff e9 93 fe ff ff e8 a1 68 2c ff \u003c0f\u003e 0b e8 9a 68 2c ff 0f 0b 0f 1f 84 00 00 00 00 00 55 41 57 41 56\n RSP: 0018:ffffc90003b4f258 EFLAGS: 00010293\n RAX: ffffffff825e318f RBX: 0000000000000000 RCX: ffff8880739dd7c0\n RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000\n RBP: ffffc90003b4f430 R08: ffffffff825e2d9b R09: ffffed10045157d1\n R10: ffffed10045157d1 R11: 1ffff110045157d0 R12: ffff8880228abe80\n R13: ffff88807016c000 R14: dffffc0000000000 R15: ffff8880228abe00\n FS:  0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000\n CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n CR2: 00007fa6ebe88718 CR3: 000000001e93d000 CR4: 00000000003506f0\n DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\n DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\n Call Trace:\n  \u003cTASK\u003e\n  hfs_write_inode+0x1bc/0xb40\n  write_inode fs/fs-writeback.c:1440 [inline]\n  __writeback_single_inode+0x4d6/0x670 fs/fs-writeback.c:1652\n  writeback_sb_inodes+0xb3b/0x18f0 fs/fs-writeback.c:1878\n  __writeback_inodes_wb+0x125/0x420 fs/fs-writeback.c:1949\n  wb_writeback+0x440/0x7b0 fs/fs-writeback.c:2054\n  wb_check_start_all fs/fs-writeback.c:2176 [inline]\n  wb_do_writeback fs/fs-writeback.c:2202 [inline]\n  wb_workfn+0x827/0xef0 fs/fs-writeback.c:2235\n  process_one_work+0x877/0xdb0 kernel/workqueue.c:2289\n  worker_thread+0xb14/0x1330 kernel/workqueue.c:2436\n  kthread+0x266/0x300 kernel/kthread.c:376\n  ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306\n  \u003c/TASK\u003e\n\nThe BUG_ON() is triggered at here:\n\n/* Dispose of resources used by a node */\nvoid hfs_bnode_put(struct hfs_bnode *node)\n{\n\tif (node) {\n \t\t\u003cskipped\u003e\n \t\tBUG_ON(!atomic_read(\u0026node-\u003erefcnt)); \u003c- we have issue here!!!!\n \t\t\u003cskipped\u003e\n \t}\n}\n\nBy tracing the refcnt, I found the node is created by hfs_bmap_alloc()\nwith refcnt 1.  Then the node is used by hfs_btree_write().  There is a\nmissing of hfs_bnode_get() after find the node.  The issue happened in\nfollowing path:\n\n\u003calloc\u003e\n hfs_bmap_alloc\n   hfs_bnode_find\n     __hfs_bnode_create   \u003c- allocate a new node with refcnt 1.\n   hfs_bnode_put          \u003c- decrease the refcnt\n\n\u003cwrite\u003e\n hfs_btree_write\n   hfs_bnode_find\n     __hfs_bnode_create\n       hfs_bnode_findhash \u003c- find the node without refcnt increased.\n   hfs_bnode_put\t  \u003c- trigger the BUG_ON() since refcnt is 0."
        }
      ],
      "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 - HFS is a local disk/removable-media filesystem; the race is driven entirely through local syscalls (`sync()`, `link()`, `create()`) against a mounted HFS volume. No network protocol handling is involved.\nAC:L - The attacker controls both sides of the race \u2014 one thread loops `sync()`/`fsync()` to drive `hfs_write_inode()` \u2192 `hfs_btree_write()` while another loops directory creations to drive `hfs_bmap_alloc()`, both landing in `hfs_bnode_find(tree, 0)`. The window can be retried indefinitely at will.\nPR:L - Once an HFS volume is mounted (udisks2 auto-mount of removable Apple media, kiosk/desktop, or an admin-mounted share), any unprivileged local user with write access to it can issue the concurrent syscalls that trigger the missing reference. No capability is needed to reach the racing paths.\nUI:N - With the HFS volume already mounted \u2014 the normal state on systems that auto-mount removable media \u2014 no victim action is required; the attacker triggers the race purely with their own concurrent syscalls.\nS:U - The corruption is confined to kernel memory managed by the same kernel security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The borrowed reference lets refcnt reach zero while another thread still holds the node, so `hfs_bnode_free()` kfree\u0027s the `struct hfs_bnode` and drops the btree page references underneath a live user \u2014 a use-after-free that permits reading reclaimed kernel heap contents.\nI:H - The same premature free gives a write-after-free on the reallocated `hfs_bnode` slab object and on the released btree pages, which can be heap-sprayed to corrupt adjacent kernel objects and hijack control flow.\nA:H - Syzbot demonstrated a hard `BUG_ON(!atomic_read(\u0026node-\u003erefcnt))` at fs/hfs/bnode.c:466 inside the writeback kworker, killing the flusher thread and oopsing (panic with panic_on_oops); the UAF path additionally causes memory corruption crashes."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T09:16:26.547Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/062af3e9930762d1fd22946748d34e0d859e4a8e"
        },
        {
          "url": "https://git.kernel.org/stable/c/3a9065a33988c02789722be612f7c42fb8ebbb22"
        },
        {
          "url": "https://git.kernel.org/stable/c/eda6879272e4df5456afc36642052ea066f58410"
        },
        {
          "url": "https://git.kernel.org/stable/c/dc9f78b6d254427a06e568f2887b1011ef3143ef"
        },
        {
          "url": "https://git.kernel.org/stable/c/2cab8db14566cf6a516c1f103a60cf6b7f54b1e5"
        },
        {
          "url": "https://git.kernel.org/stable/c/8140cdc57bc5844cd5e1392673ec2dbf8fdc6940"
        },
        {
          "url": "https://git.kernel.org/stable/c/38d72e6604b9f96dffcc0565090cc01622a37b2a"
        },
        {
          "url": "https://git.kernel.org/stable/c/a9dc087fd3c484fd1ed18c5efb290efaaf44ce03"
        }
      ],
      "title": "hfs: fix missing hfs_bnode_get() in __hfs_bnode_create",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2023-53862",
    "datePublished": "2025-12-09T01:30:30.902Z",
    "dateReserved": "2025-12-09T01:27:17.829Z",
    "dateUpdated": "2026-08-05T09:16:26.547Z",
    "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.

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EUVD-2026-345338

CVE-2023-53862 (GCVE-0-2023-53862)

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