CVE-2026-53129

fs/mbcache: cancel shrink work before destroying the cache

HIGH 7.8

En bref

Source
NVD
EPSS
EPSS 0.12 % · centile 2 ()
État
PUBLISHED
Publiée
Mise à jour
Attribuée par
Linux
Statut NVD
Modified

Description

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.

Faiblesses (CWE)

  • CWE-416 — Utilisation après libération

Références

Scores

VersionScoreVecteurÉvalué par
CVSS 3.1HIGH 7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HNVD · nvd@nist.gov (Primary)

Références européennes

Avis du CERT-FR

Configurations affectées (CPE NVD)

Produits affectés

ProduitVersions
Linux · Linuxaffected c2f3140fe2eceb3a6c1615b2648b9471544881c6 < cbdd6f0fb19a0ce8a013acd80ac87a62f57fa20d ; affected c2f3140fe2eceb3a6c1615b2648b9471544881c6 < a88d39a74a208e197c03bffaa2df34de732af19f ; affected c2f3140fe2eceb3a6c1615b2648b9471544881c6 < 0e4eff315d799f5842b95872199b0f0fb8ef5f51 ; affected c2f3140fe2eceb3a6c1615b2648b9471544881c6 < b25fd3523bef88fb7ffd4c5b63bbe9c08f73bb4c ; affected c2f3140fe2eceb3a6c1615b2648b9471544881c6 < d227786ab1119669df4dc333a61510c52047cce4
Linux · Linuxaffected 4.6 ; unaffected 0 < 4.6 ; unaffected 6.6.160 ≤ 6.6.* ; unaffected 6.12.91 ≤ 6.12.* ; unaffected 6.18.33 ≤ 6.18.* ; unaffected 7.0.10 ≤ 7.0.*

Sources

SourceLicence
CVE List (CVEProject cvelistV5)CVE Program Terms of Use
EPSS (FIRST.org)FIRST — attribution requested
ENISA EUVDENISA — reproduction authorised, source acknowledged
CERT-FR (ANSSI)Licence Ouverte / Etalab 2.0
NVD (NIST) via fkie-cad/nvd-json-data-feedsPublic domain — this product uses data from the NVD API but is not endorsed or certified by the NVD