Heimdall Security Logo

CVE-2026-74594

Vulnérabilité élevée dans Linux (Linux)

CVSS 7.8 · Élevée
EPSS 0.1%
Linux•Linux•Versions : <611e7821c4f83a671455658797336faecc3a5196, <=6.1.*, <=6.12.*, 5.13.2, <8037c5b2b2a447df52542f4d8535895d837bdcbd, 6.6.152, <5.13, 5.15.217, 0, <1e5ca82eee59caca6988f9d6e859786aab8a5fa0, <=7.1.*, <4addb102154b7cf6e2310ccbe20c3c08619e520d, <5.14, 6bfcb6178925b1fd28c102e53d403091b8f49396, <=5.10.*, <5.10.266, <=6.6.*, 5.14, 7.1.9, 5.10.266, 6.1.183, e1e5e263bbe0e6e9c3db36aa48a3c8acf546fa49, <=6.18.*, 6.12.104, <894a9300d7fb2e2951da92e565ae6de7ddfb0a69, 979965c33f734a1666af67900408f997ac669c23, 6.18.45, <=*, <=5.15.*, 5.12.17, <310b5a537a78c358a4cd244bd767c1a517a05459, 8f91efd870ea5d8bc10b0fcc9740db51cd4c0c83, 5.10.50, <5457025fa8ca3c0d2732109513de839e3e797190, 7.2, <806fcff98c1d7cb3c1dc0015e55ebdbe819e6b08

Description

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.

Gravité et risque d'exploitation

CVE-2026-74594 obtient un score CVSS de 7.8/10, soit une gravité élevée. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 0.13 %, ce qui la place devant 2.3 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions <611e7821c4f83a671455658797336faecc3a5196, <=6.1.*, <=6.12.*, 5.13.2, <8037c5b2b2a447df52542f4d8535895d837bdcbd, 6.6.152, <5.13, 5.15.217, 0, <1e5ca82eee59caca6988f9d6e859786aab8a5fa0, <=7.1.*, <4addb102154b7cf6e2310ccbe20c3c08619e520d, <5.14, 6bfcb6178925b1fd28c102e53d403091b8f49396, <=5.10.*, <5.10.266, <=6.6.*, 5.14, 7.1.9, 5.10.266, 6.1.183, e1e5e263bbe0e6e9c3db36aa48a3c8acf546fa49, <=6.18.*, 6.12.104, <894a9300d7fb2e2951da92e565ae6de7ddfb0a69, 979965c33f734a1666af67900408f997ac669c23, 6.18.45, <=*, <=5.15.*, 5.12.17, <310b5a537a78c358a4cd244bd767c1a517a05459, 8f91efd870ea5d8bc10b0fcc9740db51cd4c0c83, 5.10.50, <5457025fa8ca3c0d2732109513de839e3e797190, 7.2, <806fcff98c1d7cb3c1dc0015e55ebdbe819e6b08) est présent sur votre parc.
  • Appliquez le correctif ou la version corrigée indiqués dans les références de l'éditeur.
  • À défaut de correctif, limitez l'exposition (filtrage réseau, désactivation du composant).
  • Automatisez la détection : les agents CVE Heimdall (gratuits, open source) corrèlent l'inventaire de vos serveurs avec la base CVE.

Références

Rechercher une autre CVE