{"id":"CVE-2025-39953","revision":null,"records":[{"revision":"5aee4d13e3cf4674903d532ebb32d73b","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2025-39953","aliases":[],"title":"cgroup: split cgroup_destroy_wq into 3 workqueues","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ncgroup: split cgroup_destroy_wq into 3 workqueues\n\nA hung task can occur during [1] LTP cgroup testing when repeatedly\nmounting/unmounting perf_event and net_prio controllers with\nsystemd.unified_cgroup_hierarchy=1. The hang manifests in\ncgroup_lock_and_drain_offline() during root destruction.\n\nRelated case:\ncgroup_fj_function_perf_event cgroup_fj_function.sh perf_event\ncgroup_fj_function_net_prio cgroup_fj_function.sh net_prio\n\nCall Trace:\n\tcgroup_lock_and_drain_offline+0x14c/0x1e8\n\tcgroup_destroy_root+0x3c/0x2c0\n\tcss_free_rwork_fn+0x248/0x338\n\tprocess_one_work+0x16c/0x3b8\n\tworker_thread+0x22c/0x3b0\n\tkthread+0xec/0x100\n\tret_from_fork+0x10/0x20\n\nRoot Cause:\n\nCPU0 CPU1\nmount perf_event umount net_prio\ncgroup1_get_tree cgroup_kill_sb\nrebind_subsystems // root destruction enqueues\n\t\t\t\t// cgroup_destroy_wq\n// kill all perf_event css\n // one perf_event css A is dying\n // css A offline enqueues cgroup_destroy_wq\n // root destruction will be executed first\n css_free_rwork_fn\n cgroup_destroy_root\n cgroup_lock_and_drain_offline\n // some perf descendants are dying\n // cgroup_destroy_wq max_active = 1\n // waiting for css A to die\n\nProblem scenario:\n1. CPU0 mounts perf_event (rebind_subsystems)\n2. CPU1 unmounts net_prio (cgroup_kill_sb), queuing root destruction work\n3. A dying perf_event CSS gets queued for offline after root destruction\n4. Root destruction waits for offline completion, but offline work is\n blocked behind root destruction in cgroup_destroy_wq (max_active=1)\n\nSolution:\nSplit cgroup_destroy_wq into three dedicated workqueues:\ncgroup_offline_wq – Handles CSS offline operations\ncgroup_release_wq – Manages resource release\ncgroup_free_wq – Performs final memory deallocation\n\nThis separation eliminates blocking in the CSS free path while waiting for\noffline operations to complete.\n\n[1] https://github.com/linux-test-project/ltp/blob/master/runtest/controllers","state":0,"publishedAt":"2025-10-04T07:31:13.237+00:00","modifiedAt":"2026-10-15T01:08:38.925+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 \"kernel/cgroup/cgroup.c\"\n ],\n \"versions\": [\n {\n \"version\": \"334c3679ec4b2b113c35ebe37d2018b112dd5013\",\n \"lessThan\": \"cabadd7fd15f97090f752fd22dd7f876a0dc3dc4\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"334c3679ec4b2b113c35ebe37d2018b112dd5013\",\n \"lessThan\": \"a0c896bda7077aa5005473e2c5b3c27173313b4c\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"334c3679ec4b2b113c35ebe37d2018b112dd5013\",\n \"lessThan\": \"f2795d1b92506e3adf52a298f7181032a1525e04\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"334c3679ec4b2b113c35ebe37d2018b112dd5013\",\n \"lessThan\": \"993049c9b1355c78918344a6403427d53f9ee700\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"334c3679ec4b2b113c35ebe37d2018b112dd5013\",\n \"lessThan\": \"4a1e3ec28e8062cd9f339aa6a942df9c5bcb6811\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"334c3679ec4b2b113c35ebe37d2018b112dd5013\",\n \"lessThan\": \"ded4d207a3209a834b6831ceec7f39b934c74802\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"334c3679ec4b2b113c35ebe37d2018b112dd5013\",\n \"lessThan\": \"05e0b03447cf215ec384210441b34b7a3b16e8b0\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"334c3679ec4b2b113c35ebe37d2018b112dd5013\",\n \"lessThan\": \"79f919a89c9d06816dbdbbd168fa41d27411a7f9\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\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 \"kernel/cgroup/cgroup.c\"\n ],\n \"versions\": [\n {\n \"version\": \"4.6\",\n \"status\": \"affected\"\n },\n {\n \"version\": \"0\",\n \"lessThan\": \"4.6\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.4.300\",\n \"lessThanOrEqual\": \"5.4.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.10.245\",\n \"lessThanOrEqual\": \"5.10.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.15.194\",\n \"lessThanOrEqual\": \"5.15.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.1.154\",\n \"lessThanOrEqual\": \"6.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.6.108\",\n \"lessThanOrEqual\": \"6.6.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.12.49\",\n \"lessThanOrEqual\": \"6.12.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.16.9\",\n \"lessThanOrEqual\": \"6.16.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.17\",\n \"lessThanOrEqual\": \"*\",\n \"status\": \"unaffected\",\n \"versionType\": \"original_commit_for_fix\"\n }\n ]\n }"}],"metrics":[],"references":["https://git.kernel.org/stable/c/cabadd7fd15f97090f752fd22dd7f876a0dc3dc4","https://git.kernel.org/stable/c/a0c896bda7077aa5005473e2c5b3c27173313b4c","https://git.kernel.org/stable/c/f2795d1b92506e3adf52a298f7181032a1525e04","https://git.kernel.org/stable/c/993049c9b1355c78918344a6403427d53f9ee700","https://git.kernel.org/stable/c/4a1e3ec28e8062cd9f339aa6a942df9c5bcb6811","https://git.kernel.org/stable/c/ded4d207a3209a834b6831ceec7f39b934c74802","https://git.kernel.org/stable/c/05e0b03447cf215ec384210441b34b7a3b16e8b0","https://git.kernel.org/stable/c/79f919a89c9d06816dbdbbd168fa41d27411a7f9"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2025-39953","license":"CVE Program Terms of Use","key":"cve-program:CVE-2025-39953","identifiers":["CVE-2025-39953"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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