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GHSA-76P3-3V32-9XXH

Vulnerability from github – Published: 2026-06-24 18:32 – Updated: 2026-06-24 18:32

Details

In the Linux kernel, the following vulnerability has been resolved:

fs/mbcache: cancel shrink work before destroying the cache

mb_cache_destroy() calls shrinker_free() and then frees all cache entries and the cache itself, but it does not cancel the pending c_shrink_work work item first.

If mb_cache_entry_create() schedules c_shrink_work via schedule_work() and the work item is still pending or running when mb_cache_destroy() runs, mb_cache_shrink_worker() will access the cache after its memory has been freed, causing a use-after-free.

This is only reachable by a privileged user (root or CAP_SYS_ADMIN) who can trigger the last put of a mounted ext2/ext4/ocfs2 filesystem.

Cancel the work item with cancel_work_sync() before calling shrinker_free(), ensuring the worker has finished and will not be rescheduled before the cache is torn down.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-53129"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-06-24T17:17:28Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nfs/mbcache: cancel shrink work before destroying the cache\n\nmb_cache_destroy() calls shrinker_free() and then frees all cache\nentries and the cache itself, but it does not cancel the pending\nc_shrink_work work item first.\n\nIf mb_cache_entry_create() schedules c_shrink_work via schedule_work()\nand the work item is still pending or running when mb_cache_destroy()\nruns, mb_cache_shrink_worker() will access the cache after its memory\nhas been freed, causing a use-after-free.\n\nThis is only reachable by a privileged user (root or CAP_SYS_ADMIN)\nwho can trigger the last put of a mounted ext2/ext4/ocfs2 filesystem.\n\nCancel the work item with cancel_work_sync() before calling\nshrinker_free(), ensuring the worker has finished and will not be\nrescheduled before the cache is torn down.",
  "id": "GHSA-76p3-3v32-9xxh",
  "modified": "2026-06-24T18:32:48Z",
  "published": "2026-06-24T18:32:48Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-53129"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0e4eff315d799f5842b95872199b0f0fb8ef5f51"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a88d39a74a208e197c03bffaa2df34de732af19f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b25fd3523bef88fb7ffd4c5b63bbe9c08f73bb4c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d227786ab1119669df4dc333a61510c52047cce4"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-53129 (GCVE-0-2026-53129)

Vulnerability from cvelistv5 – Published: 2026-06-24 16:30 – Updated: 2026-06-24 16:30

Title

fs/mbcache: cancel shrink work before destroying the cache

Summary

In the Linux kernel, the following vulnerability has been resolved: fs/mbcache: cancel shrink work before destroying the cache mb_cache_destroy() calls shrinker_free() and then frees all cache entries and the cache itself, but it does not cancel the pending c_shrink_work work item first. If mb_cache_entry_create() schedules c_shrink_work via schedule_work() and the work item is still pending or running when mb_cache_destroy() runs, mb_cache_shrink_worker() will access the cache after its memory has been freed, causing a use-after-free. This is only reachable by a privileged user (root or CAP_SYS_ADMIN) who can trigger the last put of a mounted ext2/ext4/ocfs2 filesystem. Cancel the work item with cancel_work_sync() before calling shrinker_free(), ensuring the worker has finished and will not be rescheduled before the cache is torn down.

Severity

No CVSS data available.

Assigner

Linux

References

4 references

URL	Tags
https://git.kernel.org/stable/c/a88d39a74a208e197…
https://git.kernel.org/stable/c/0e4eff315d799f584…
https://git.kernel.org/stable/c/b25fd3523bef88fb7…
https://git.kernel.org/stable/c/d227786ab1119669d…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: c2f3140fe2eceb3a6c1615b2648b9471544881c6 , < a88d39a74a208e197c03bffaa2df34de732af19f (git) Affected: c2f3140fe2eceb3a6c1615b2648b9471544881c6 , < 0e4eff315d799f5842b95872199b0f0fb8ef5f51 (git) Affected: c2f3140fe2eceb3a6c1615b2648b9471544881c6 , < b25fd3523bef88fb7ffd4c5b63bbe9c08f73bb4c (git) Affected: c2f3140fe2eceb3a6c1615b2648b9471544881c6 , < d227786ab1119669df4dc333a61510c52047cce4 (git)
Linux	Linux	Affected: 4.6 Unaffected: 0 , < 4.6 (semver) Unaffected: 6.12.91 , ≤ 6.12.* (semver) Unaffected: 6.18.33 , ≤ 6.18.* (semver) Unaffected: 7.0.10 , ≤ 7.0.* (semver) Unaffected: 7.1 , ≤ * (original_commit_for_fix)

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    "dateReserved": "2026-06-09T07:44:35.386Z",
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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.

Detection rules are retrieved from Rulezet.

Action not permitted

GHSA-76P3-3V32-9XXH

CVE-2026-53129 (GCVE-0-2026-53129)

Tags

Sightings

Nomenclature