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CVE-2026-74594: Linux

7.8

CVSS 3.1

Няма данни

Вероятност да бъде експлоатирана в следващите 30 дни (EPSS)

Няма потвърждение

Атакува се

Няма данни

Време до експлоатация

Атакува се локално, без особени условия, с обикновен потребителски вход и без действие от потребителя.

  • Експлоатация: няма данни за експлоатация
  • Атаката не може да се автоматизира

Описание

Оригинално описание

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.

Засегнати продукти

  • Linux Linux: 6bfcb6178925b1fd28c102e53d403091b8f49396 преди 4addb102154b7cf6e2310ccbe20c3c08619e520d; 8f91efd870ea5d8bc10b0fcc9740db51cd4c0c83 преди 894a9300d7fb2e2951da92e565ae6de7ddfb0a69; 8f91efd870ea5d8bc10b0fcc9740db51cd4c0c83 преди 1e5ca82eee59caca6988f9d6e859786aab8a5fa0; 8f91efd870ea5d8bc10b0fcc9740db51cd4c0c83 преди 310b5a537a78c358a4cd244bd767c1a517a05459; 8f91efd870ea5d8bc10b0fcc9740db51cd4c0c83 преди 806fcff98c1d7cb3c1dc0015e55ebdbe819e6b08; 8f91efd870ea5d8bc10b0fcc9740db51cd4c0c83 преди 8037c5b2b2a447df52542f4d8535895d837bdcbd; 8f91efd870ea5d8bc10b0fcc9740db51cd4c0c83 преди 611e7821c4f83a671455658797336faecc3a5196; 8f91efd870ea5d8bc10b0fcc9740db51cd4c0c83 преди 5457025fa8ca3c0d2732109513de839e3e797190; e1e5e263bbe0e6e9c3db36aa48a3c8acf546fa49; 979965c33f734a1666af67900408f997ac669c23; 5.10.50 преди 5.10.266; 5.12.17 преди 5.13; 5.13.2 преди 5.14
  • Linux Linux: 5.14; преди 5.14; 5.10.266 до 5.10.*; 5.15.217 до 5.15.*; 6.1.183 до 6.1.*; 6.6.152 до 6.6.*; 6.12.104 до 6.12.*; 6.18.45 до 6.18.*; 7.1.9 до 7.1.*; от 7.2 нататък

История

  • 22 август 2026 Публикувано

Други уязвимости в Linux Linux

Първоизточници

CVE-2026-74594: Linux | freedomonline.bg