{"api_version":"1","generated_at":"2026-08-22T19:18:30+00:00","cve":"CVE-2026-74594","urls":{"html":"https://cve.report/CVE-2026-74594","api":"https://cve.report/api/cve/CVE-2026-74594.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-74594","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-74594"},"summary":{"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":"PUBLISHED","assigner":"Linux","published_at":"2026-08-22 16:16:31","updated_at":"2026-08-22 16:16:31"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/806fcff98c1d7cb3c1dc0015e55ebdbe819e6b08","name":"https://git.kernel.org/stable/c/806fcff98c1d7cb3c1dc0015e55ebdbe819e6b08","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/611e7821c4f83a671455658797336faecc3a5196","name":"https://git.kernel.org/stable/c/611e7821c4f83a671455658797336faecc3a5196","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/5457025fa8ca3c0d2732109513de839e3e797190","name":"https://git.kernel.org/stable/c/5457025fa8ca3c0d2732109513de839e3e797190","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/1e5ca82eee59caca6988f9d6e859786aab8a5fa0","name":"https://git.kernel.org/stable/c/1e5ca82eee59caca6988f9d6e859786aab8a5fa0","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/310b5a537a78c358a4cd244bd767c1a517a05459","name":"https://git.kernel.org/stable/c/310b5a537a78c358a4cd244bd767c1a517a05459","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/8037c5b2b2a447df52542f4d8535895d837bdcbd","name":"https://git.kernel.org/stable/c/8037c5b2b2a447df52542f4d8535895d837bdcbd","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-74594","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74594","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 8f91efd870ea5d8bc10b0fcc9740db51cd4c0c83 1e5ca82eee59caca6988f9d6e859786aab8a5fa0 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 8f91efd870ea5d8bc10b0fcc9740db51cd4c0c83 310b5a537a78c358a4cd244bd767c1a517a05459 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 8f91efd870ea5d8bc10b0fcc9740db51cd4c0c83 806fcff98c1d7cb3c1dc0015e55ebdbe819e6b08 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 8f91efd870ea5d8bc10b0fcc9740db51cd4c0c83 8037c5b2b2a447df52542f4d8535895d837bdcbd git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 8f91efd870ea5d8bc10b0fcc9740db51cd4c0c83 611e7821c4f83a671455658797336faecc3a5196 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 8f91efd870ea5d8bc10b0fcc9740db51cd4c0c83 5457025fa8ca3c0d2732109513de839e3e797190 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6bfcb6178925b1fd28c102e53d403091b8f49396 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected e1e5e263bbe0e6e9c3db36aa48a3c8acf546fa49 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 979965c33f734a1666af67900408f997ac669c23 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5.10.50 5.11 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5.12.17 5.13 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5.13.2 5.14 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5.14","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.14 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.183 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.152 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.104 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.45 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1.9 7.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["kernel/sched/psi.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"1e5ca82eee59caca6988f9d6e859786aab8a5fa0","status":"affected","version":"8f91efd870ea5d8bc10b0fcc9740db51cd4c0c83","versionType":"git"},{"lessThan":"310b5a537a78c358a4cd244bd767c1a517a05459","status":"affected","version":"8f91efd870ea5d8bc10b0fcc9740db51cd4c0c83","versionType":"git"},{"lessThan":"806fcff98c1d7cb3c1dc0015e55ebdbe819e6b08","status":"affected","version":"8f91efd870ea5d8bc10b0fcc9740db51cd4c0c83","versionType":"git"},{"lessThan":"8037c5b2b2a447df52542f4d8535895d837bdcbd","status":"affected","version":"8f91efd870ea5d8bc10b0fcc9740db51cd4c0c83","versionType":"git"},{"lessThan":"611e7821c4f83a671455658797336faecc3a5196","status":"affected","version":"8f91efd870ea5d8bc10b0fcc9740db51cd4c0c83","versionType":"git"},{"lessThan":"5457025fa8ca3c0d2732109513de839e3e797190","status":"affected","version":"8f91efd870ea5d8bc10b0fcc9740db51cd4c0c83","versionType":"git"},{"status":"affected","version":"6bfcb6178925b1fd28c102e53d403091b8f49396","versionType":"git"},{"status":"affected","version":"e1e5e263bbe0e6e9c3db36aa48a3c8acf546fa49","versionType":"git"},{"status":"affected","version":"979965c33f734a1666af67900408f997ac669c23","versionType":"git"},{"lessThan":"5.11","status":"affected","version":"5.10.50","versionType":"semver"},{"lessThan":"5.13","status":"affected","version":"5.12.17","versionType":"semver"},{"lessThan":"5.14","status":"affected","version":"5.13.2","versionType":"semver"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["kernel/sched/psi.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"5.14"},{"lessThan":"5.14","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.183","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.152","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.104","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.45","versionType":"semver"},{"lessThanOrEqual":"7.1.*","status":"unaffected","version":"7.1.9","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.2","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.183","versionStartIncluding":"5.14","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.152","versionStartIncluding":"5.14","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.104","versionStartIncluding":"5.14","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.45","versionStartIncluding":"5.14","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1.9","versionStartIncluding":"5.14","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2","versionStartIncluding":"5.14","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10.50","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.12.17","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.13.2","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"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."}],"providerMetadata":{"dateUpdated":"2026-08-22T15:31:44.894Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/1e5ca82eee59caca6988f9d6e859786aab8a5fa0"},{"url":"https://git.kernel.org/stable/c/310b5a537a78c358a4cd244bd767c1a517a05459"},{"url":"https://git.kernel.org/stable/c/806fcff98c1d7cb3c1dc0015e55ebdbe819e6b08"},{"url":"https://git.kernel.org/stable/c/8037c5b2b2a447df52542f4d8535895d837bdcbd"},{"url":"https://git.kernel.org/stable/c/611e7821c4f83a671455658797336faecc3a5196"},{"url":"https://git.kernel.org/stable/c/5457025fa8ca3c0d2732109513de839e3e797190"}],"title":"sched/psi: Shut down rtpoll_timer in psi_cgroup_free()","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-74594","datePublished":"2026-08-22T15:31:44.894Z","dateReserved":"2026-08-15T05:44:03.919Z","dateUpdated":"2026-08-22T15:31:44.894Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-08-22 16:16:31","lastModifiedDate":"2026-08-22 16:16:31","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"74594","Ordinal":"1","Title":"sched/psi: Shut down rtpoll_timer in psi_cgroup_free()","CVE":"CVE-2026-74594","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"74594","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"sched/psi: Shut down rtpoll_timer in psi_cgroup_free()"}]}}}