{"id":"CVE-2026-74594","revision":null,"records":[{"revision":"65059cad44fa420294a03db37248b894","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-74594","aliases":[],"title":"sched/psi: Shut down rtpoll_timer in psi_cgroup_free()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nsched/psi: Shut down rtpoll_timer in psi_cgroup_free()\n\npsi_schedule_rtpoll_work() is called locklessly from the scheduler hotpath\nand can race psi_trigger_destroy() taking down the last rtpoll trigger under\nrtpoll_trigger_lock:\n\n psi_schedule_rtpoll_work() psi_trigger_destroy()\n\n rcu_read_lock();\n task = rcu_dereference(rtpoll_task);\n rcu_assign_pointer(rtpoll_task, NULL);\n timer_delete(&rtpoll_timer);\n mod_timer(&rtpoll_timer, ...);\n rcu_read_unlock();\n synchronize_rcu();\n kthread_stop(task_to_destroy);\n\nThe group can then be freed with the re-armed timer still pending, and\npoll_timer_fn() runs on freed memory.\n\n461daba06bdc (\"psi: eliminate kthread_worker from psi trigger scheduling\nmechanism\") deleted the timer synchronously after the synchronize_rcu(),\nwhich prevented this but raced trigger creation instead: the deletion could\ncancel the timer that a new trigger set armed during the grace period and,\nas creation also reinitialized the timer at the time, corrupt it.\n8f91efd870ea (\"psi: Fix race between psi_trigger_create/destroy\") moved the\ninitialization into group_init() and the deletion into the locked section,\ntrading the creation races for the window above.\n\nNeither placement in the destruction path works. A pending timer firing\nwhile the group is alive is harmless though. poll_timer_fn() just wakes the\nrtpoll waitqueue and doesn't re-arm itself. Bind the timer to the group's\nlifetime instead and shut it down in psi_cgroup_free(). Nothing can arm it\nby then. timer_shutdown_sync() because the timer is never armed again.","state":0,"publishedAt":"2026-08-22T15:31:44.894+00:00","modifiedAt":"2026-10-16T19:05:59.691+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/sched/psi.c\"\n ],\n \"versions\": [\n {\n \"version\": \"6bfcb6178925b1fd28c102e53d403091b8f49396\",\n \"lessThan\": \"4addb102154b7cf6e2310ccbe20c3c08619e520d\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"8f91efd870ea5d8bc10b0fcc9740db51cd4c0c83\",\n \"lessThan\": \"894a9300d7fb2e2951da92e565ae6de7ddfb0a69\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"8f91efd870ea5d8bc10b0fcc9740db51cd4c0c83\",\n \"lessThan\": \"1e5ca82eee59caca6988f9d6e859786aab8a5fa0\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"8f91efd870ea5d8bc10b0fcc9740db51cd4c0c83\",\n \"lessThan\": \"310b5a537a78c358a4cd244bd767c1a517a05459\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"8f91efd870ea5d8bc10b0fcc9740db51cd4c0c83\",\n \"lessThan\": \"806fcff98c1d7cb3c1dc0015e55ebdbe819e6b08\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"8f91efd870ea5d8bc10b0fcc9740db51cd4c0c83\",\n \"lessThan\": \"8037c5b2b2a447df52542f4d8535895d837bdcbd\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"8f91efd870ea5d8bc10b0fcc9740db51cd4c0c83\",\n \"lessThan\": \"611e7821c4f83a671455658797336faecc3a5196\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"8f91efd870ea5d8bc10b0fcc9740db51cd4c0c83\",\n \"lessThan\": \"5457025fa8ca3c0d2732109513de839e3e797190\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"e1e5e263bbe0e6e9c3db36aa48a3c8acf546fa49\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"979965c33f734a1666af67900408f997ac669c23\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"5.10.50\",\n \"lessThan\": \"5.10.266\",\n \"status\": \"affected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.12.17\",\n \"lessThan\": \"5.13\",\n \"status\": \"affected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.13.2\",\n \"lessThan\": \"5.14\",\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 \"kernel/sched/psi.c\"\n ],\n \"versions\": [\n {\n \"version\": \"5.14\",\n \"status\": \"affected\"\n },\n {\n \"version\": \"0\",\n \"lessThan\": \"5.14\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.10.266\",\n \"lessThanOrEqual\": \"5.10.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.15.217\",\n \"lessThanOrEqual\": \"5.15.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.1.183\",\n \"lessThanOrEqual\": \"6.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.6.152\",\n \"lessThanOrEqual\": \"6.6.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.12.104\",\n \"lessThanOrEqual\": \"6.12.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.18.45\",\n \"lessThanOrEqual\": \"6.18.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.1.9\",\n \"lessThanOrEqual\": \"7.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.2\",\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/4addb102154b7cf6e2310ccbe20c3c08619e520d","https://git.kernel.org/stable/c/894a9300d7fb2e2951da92e565ae6de7ddfb0a69","https://git.kernel.org/stable/c/1e5ca82eee59caca6988f9d6e859786aab8a5fa0","https://git.kernel.org/stable/c/310b5a537a78c358a4cd244bd767c1a517a05459","https://git.kernel.org/stable/c/806fcff98c1d7cb3c1dc0015e55ebdbe819e6b08","https://git.kernel.org/stable/c/8037c5b2b2a447df52542f4d8535895d837bdcbd","https://git.kernel.org/stable/c/611e7821c4f83a671455658797336faecc3a5196","https://git.kernel.org/stable/c/5457025fa8ca3c0d2732109513de839e3e797190"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-74594","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-74594","identifiers":["CVE-2026-74594"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all 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