{"id":"CVE-2026-53129","state":"PUBLISHED","title":"fs/mbcache: cancel shrink work before destroying the cache","description":"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.","publishedAt":"2026-06-24T16:30:56.562Z","updatedAt":"2026-10-30T12:26:41.852Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"c2f3140fe2eceb3a6c1615b2648b9471544881c6","status":"affected","lessThan":"40148c615687c1692712e50a6de53d62dfbfc20f","versionType":"git"},{"version":"c2f3140fe2eceb3a6c1615b2648b9471544881c6","status":"affected","lessThan":"cbdd6f0fb19a0ce8a013acd80ac87a62f57fa20d","versionType":"git"},{"version":"c2f3140fe2eceb3a6c1615b2648b9471544881c6","status":"affected","lessThan":"a88d39a74a208e197c03bffaa2df34de732af19f","versionType":"git"},{"version":"c2f3140fe2eceb3a6c1615b2648b9471544881c6","status":"affected","lessThan":"0e4eff315d799f5842b95872199b0f0fb8ef5f51","versionType":"git"},{"version":"c2f3140fe2eceb3a6c1615b2648b9471544881c6","status":"affected","lessThan":"b25fd3523bef88fb7ffd4c5b63bbe9c08f73bb4c","versionType":"git"},{"version":"c2f3140fe2eceb3a6c1615b2648b9471544881c6","status":"affected","lessThan":"d227786ab1119669df4dc333a61510c52047cce4","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/mbcache.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.6","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.6","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.91","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.33","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.0.10","status":"unaffected","lessThanOrEqual":"7.0.*","versionType":"semver"},{"version":"7.1","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/mbcache.c"]}],"references":["https://git.kernel.org/stable/c/40148c615687c1692712e50a6de53d62dfbfc20f","https://git.kernel.org/stable/c/cbdd6f0fb19a0ce8a013acd80ac87a62f57fa20d","https://git.kernel.org/stable/c/a88d39a74a208e197c03bffaa2df34de732af19f","https://git.kernel.org/stable/c/0e4eff315d799f5842b95872199b0f0fb8ef5f51","https://git.kernel.org/stable/c/b25fd3523bef88fb7ffd4c5b63bbe9c08f73bb4c","https://git.kernel.org/stable/c/d227786ab1119669df4dc333a61510c52047cce4"],"weaknesses":[],"ingestedAt":"2026-10-30T12:44:04.813Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/53xxx/CVE-2026-53129.json","commit":"db8103c5921aac81d5d90efcf3745980dafabf49","baselineCommit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-53129","state":"PUBLISHED","datePublished":"2026-06-24T16:30:56.562Z","dateUpdated":"2026-10-30T12:26:41.852Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-06-09T07:44:35.386Z"},"containers":{"cna":{"title":"fs/mbcache: cancel shrink work before destroying the cache","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"c2f3140fe2eceb3a6c1615b2648b9471544881c6","status":"affected","lessThan":"40148c615687c1692712e50a6de53d62dfbfc20f","versionType":"git"},{"version":"c2f3140fe2eceb3a6c1615b2648b9471544881c6","status":"affected","lessThan":"cbdd6f0fb19a0ce8a013acd80ac87a62f57fa20d","versionType":"git"},{"version":"c2f3140fe2eceb3a6c1615b2648b9471544881c6","status":"affected","lessThan":"a88d39a74a208e197c03bffaa2df34de732af19f","versionType":"git"},{"version":"c2f3140fe2eceb3a6c1615b2648b9471544881c6","status":"affected","lessThan":"0e4eff315d799f5842b95872199b0f0fb8ef5f51","versionType":"git"},{"version":"c2f3140fe2eceb3a6c1615b2648b9471544881c6","status":"affected","lessThan":"b25fd3523bef88fb7ffd4c5b63bbe9c08f73bb4c","versionType":"git"},{"version":"c2f3140fe2eceb3a6c1615b2648b9471544881c6","status":"affected","lessThan":"d227786ab1119669df4dc333a61510c52047cce4","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/mbcache.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.6","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.6","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.91","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.33","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.0.10","status":"unaffected","lessThanOrEqual":"7.0.*","versionType":"semver"},{"version":"7.1","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/mbcache.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/40148c615687c1692712e50a6de53d62dfbfc20f"},{"url":"https://git.kernel.org/stable/c/cbdd6f0fb19a0ce8a013acd80ac87a62f57fa20d"},{"url":"https://git.kernel.org/stable/c/a88d39a74a208e197c03bffaa2df34de732af19f"},{"url":"https://git.kernel.org/stable/c/0e4eff315d799f5842b95872199b0f0fb8ef5f51"},{"url":"https://git.kernel.org/stable/c/b25fd3523bef88fb7ffd4c5b63bbe9c08f73bb4c"},{"url":"https://git.kernel.org/stable/c/d227786ab1119669df4dc333a61510c52047cce4"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-30T12:26:41.852Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.6","versionEndExcluding":"6.1.191"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.6","versionEndExcluding":"6.6.160"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.6","versionEndExcluding":"6.12.91"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.6","versionEndExcluding":"6.18.33"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.6","versionEndExcluding":"7.0.10"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.6","versionEndExcluding":"7.1"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}