Answer in brief
CVE-2026-74594 records a High severity (CVSS 7.8) vulnerability in sched/psi: Shut down rtpoll_timer in psi_cgroup_free(). The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=8f91efd870ea5d8bc10b0fcc9740db51cd4c0c83 <1e5ca82eee59caca6988f9d6e859786aab8a5fa0 || >=8f91efd870ea5d8bc10b0fcc9740db51cd4c0c83 <310b5a537a78c358a4cd244bd767c1a517a05459 || >=8f91efd870ea5d8bc10b0fcc9740db51cd4c0c83 <806fcff98c1d7cb3c1dc0015e55ebdbe819e6b08 || >=8f91efd870ea5d8bc10b0fcc9740db51cd4c0c83 <8037c5b2b2a447df52542f4d8535895d837bdcbd || >=8f91efd870ea5d8bc10b0fcc9740db51cd4c0c83 <611e7821c4f83a671455658797336faecc3a5196 || >=8f91efd870ea5d8bc10b0fcc9740db51cd4c0c83 <5457025fa8ca3c0d2732109513de839e3e797190 || 6bfcb6178925b1fd28c102e53d403091b8f49396 || e1e5e263bbe0e6e9c3db36aa48a3c8acf546fa49 || 979965c33f734a1666af67900408f997ac669c23 || >=5.10.50 <5.11 || >=5.12.17 <5.13 || >=5.13.2 <5.14 | 1e5ca82eee59caca6988f9d6e859786aab8a5fa0, 310b5a537a78c358a4cd244bd767c1a517a05459, 806fcff98c1d7cb3c1dc0015e55ebdbe819e6b08, 8037c5b2b2a447df52542f4d8535895d837bdcbd, 611e7821c4f83a671455658797336faecc3a5196, 5457025fa8ca3c0d2732109513de839e3e797190, 5.11, 5.13, 5.14 |
| Linux/Linuxgeneric | 5.14 | Not reported |
| Linux/Linuxgeneric | >=6bfcb6178925b1fd28c102e53d403091b8f49396 <4addb102154b7cf6e2310ccbe20c3c08619e520d || >=8f91efd870ea5d8bc10b0fcc9740db51cd4c0c83 <894a9300d7fb2e2951da92e565ae6de7ddfb0a69 || >=8f91efd870ea5d8bc10b0fcc9740db51cd4c0c83 <1e5ca82eee59caca6988f9d6e859786aab8a5fa0 || >=8f91efd870ea5d8bc10b0fcc9740db51cd4c0c83 <310b5a537a78c358a4cd244bd767c1a517a05459 || >=8f91efd870ea5d8bc10b0fcc9740db51cd4c0c83 <806fcff98c1d7cb3c1dc0015e55ebdbe819e6b08 || >=8f91efd870ea5d8bc10b0fcc9740db51cd4c0c83 <8037c5b2b2a447df52542f4d8535895d837bdcbd || >=8f91efd870ea5d8bc10b0fcc9740db51cd4c0c83 <611e7821c4f83a671455658797336faecc3a5196 || >=8f91efd870ea5d8bc10b0fcc9740db51cd4c0c83 <5457025fa8ca3c0d2732109513de839e3e797190 || e1e5e263bbe0e6e9c3db36aa48a3c8acf546fa49 || 979965c33f734a1666af67900408f997ac669c23 || >=5.10.50 <5.10.266 || >=5.12.17 <5.13 || >=5.13.2 <5.14 | 4addb102154b7cf6e2310ccbe20c3c08619e520d, 894a9300d7fb2e2951da92e565ae6de7ddfb0a69, 1e5ca82eee59caca6988f9d6e859786aab8a5fa0, 310b5a537a78c358a4cd244bd767c1a517a05459, 806fcff98c1d7cb3c1dc0015e55ebdbe819e6b08, 8037c5b2b2a447df52542f4d8535895d837bdcbd, 611e7821c4f83a671455658797336faecc3a5196, 5457025fa8ca3c0d2732109513de839e3e797190, 5.10.266, 5.13, 5.14 |
Published upstream
Aug 22, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 25, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 22, 2026
In the Linux kernel, the following vulnerability has been resolved: sched/psi: Shut down rtpoll_timer in psi_cgroup_free() psi_schedule_rtpoll_work() is called locklessly from the scheduler hotpath and can race psi_trigger_destroy() taking down the last rtpoll trigger under rtpoll_trigger_lock: psi_schedule_rtpoll_work() psi_trigger_destroy() rcu_read_lock(); task = rcu_dereference(rtpoll_task); rcu_assign_pointer(rtpoll_task, NULL); timer_delete(&rtpoll_timer); mod_timer(&rtpoll_timer, ...); rcu_read_unlock(); synchronize_rcu(); kthread_stop(task_to_destroy); The group can then be freed with the re-armed timer still pending, and poll_timer_fn() runs on freed memory. 461daba06bdc ("psi: eliminate kthread_worker from psi trigger scheduling mechanism") deleted the timer synchronously after the synchronize_rcu(), which prevented this but raced trigger creation instead: the deletion could cancel the timer that a new trigger set armed during the grace period and, as creation also reinitialized the timer at the time, corrupt it. 8f91efd870ea ("psi: Fix race between psi_trigger_create/destroy") moved the initialization into group_init() and the deletion into the locked section, trading the creation races for the window above. Neither placement in the destruction path works. A pending timer firing while the group is alive is harmless though. poll_timer_fn() just wakes the rtpoll waitqueue and doesn't re-arm itself. Bind the timer to the group's lifetime instead and shut it down in psi_cgroup_free(). Nothing can arm it by then. timer_shutdown_sync() because the timer is never armed again.
Quoted source text, attributed separately from HOL analysis.