{"id":"CVE-2026-90326","revision":null,"records":[{"revision":"5ee6236a06014e78922358b23abf91e2","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-90326","aliases":[],"title":"blk-cgroup: fix race between policy activation and blkg destruction","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nblk-cgroup: fix race between policy activation and blkg destruction\n\nWhen switching an IO scheduler on a block device, blkcg_activate_policy()\nallocates blkg_policy_data (pd) for all blkgs attached to the queue.\nHowever, blkcg_activate_policy() may race with concurrent blkcg deletion,\nleading to use-after-free and memory leak issues.\n\nThe use-after-free occurs in the following race:\n\nT1 (blkcg_activate_policy):\n - Successfully allocates pd for blkg1 (loop0->queue, blkcgA)\n - Fails to allocate pd for blkg2 (loop0->queue, blkcgB)\n - Enters the enomem rollback path to release blkg1 resources\n\nT2 (blkcg deletion):\n - blkcgA is deleted concurrently\n - blkg1 is freed via blkg_free_workfn()\n - blkg1->pd is freed\n\nT1 (continued):\n - Rollback path accesses blkg1->pd->online after pd is freed\n - Triggers use-after-free\n\nIn addition, blkg_free_workfn() frees pd before removing the blkg from\nq->blkg_list. This allows blkcg_activate_policy() to allocate a new pd\nfor a blkg that is being destroyed, leaving the newly allocated pd\nunreachable when the blkg is finally freed.\n\nFix these races by extending blkcg_mutex coverage to serialize\nblkcg_activate_policy() rollback and blkg destruction, ensuring pd\nlifecycle is synchronized with blkg list visibility.","state":0,"publishedAt":"2026-09-17T16:08:41.374+00:00","modifiedAt":"2026-10-21T12:51:00.266+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"unaffected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"block/blk-cgroup.c\"\n ],\n \"versions\": [\n {\n \"version\": \"81c1188905f88b77743d1fdeeedfc8cb7b67787d\",\n \"lessThan\": \"b5dae1cd0d8368b4338430ff93403df67f0b8bcc\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"bfe46d2efe46c5c952f982e2ca94fe2ec5e58e2a\",\n \"lessThan\": \"083b58373463a6e5ee60ecb135269348f68ad7df\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"f1c006f1c6850c14040f8337753a63119bba39b9\",\n \"lessThan\": \"17c18a0df70c2b89ff7fcd74622f1540e98d00fd\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"f1c006f1c6850c14040f8337753a63119bba39b9\",\n \"lessThan\": \"91062e3a9ed251726df4e20ff9a1113f1c8ded59\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"f1c006f1c6850c14040f8337753a63119bba39b9\",\n \"lessThan\": \"ac34e655dffa74349d885a43d098115336f53842\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"f1c006f1c6850c14040f8337753a63119bba39b9\",\n \"lessThan\": \"2cf9f50a38c1839e549a08e22aa35e8d69e2c8fd\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"f1c006f1c6850c14040f8337753a63119bba39b9\",\n \"lessThan\": \"5313d4d41739b0cb63000747c97bb1217ac45f3e\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"6.1.16\",\n \"lessThan\": \"6.1.17\",\n \"status\": \"affected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.2.3\",\n \"lessThan\": \"6.2.4\",\n \"status\": \"affected\",\n \"versionType\": \"semver\"\n }\n ]\n }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"affected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"block/blk-cgroup.c\"\n ],\n \"versions\": [\n {\n \"version\": \"6.3\",\n \"status\": \"affected\"\n },\n {\n \"version\": \"0\",\n \"lessThan\": \"6.3\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.1.17\",\n \"lessThanOrEqual\": \"6.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.2.4\",\n \"lessThanOrEqual\": \"6.2.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.6.160\",\n \"lessThanOrEqual\": \"6.6.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.12.114\",\n \"lessThanOrEqual\": \"6.12.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.18.52\",\n \"lessThanOrEqual\": \"6.18.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.2.6\",\n \"lessThanOrEqual\": \"7.2.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.3\",\n \"lessThanOrEqual\": \"*\",\n \"status\": \"unaffected\",\n \"versionType\": \"original_commit_for_fix\"\n }\n ]\n }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/b5dae1cd0d8368b4338430ff93403df67f0b8bcc","https://git.kernel.org/stable/c/083b58373463a6e5ee60ecb135269348f68ad7df","https://git.kernel.org/stable/c/17c18a0df70c2b89ff7fcd74622f1540e98d00fd","https://git.kernel.org/stable/c/91062e3a9ed251726df4e20ff9a1113f1c8ded59","https://git.kernel.org/stable/c/ac34e655dffa74349d885a43d098115336f53842","https://git.kernel.org/stable/c/2cf9f50a38c1839e549a08e22aa35e8d69e2c8fd","https://git.kernel.org/stable/c/5313d4d41739b0cb63000747c97bb1217ac45f3e"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-90326","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-90326","identifiers":["CVE-2026-90326"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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