VULNERABILITY INTELLIGENCE

CVE-2025-38352

CVSS score7.8 HIGH
EPSS probability1.36%
CISA KEVKnown exploited vulnerability
Published2025-07-22
Last modified2026-09-08
CVSS vectorCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Known Exploited Vulnerability

Linux Kernel Time-of-Check Time-of-Use (TOCTOU) Race Condition Vulnerability

Vendor / product: Linux / Kernel

Description

In the Linux kernel, the following vulnerability has been resolved: posix-cpu-timers: fix race between handle_posix_cpu_timers() and posix_cpu_timer_del() If an exiting non-autoreaping task has already passed exit_notify() and calls handle_posix_cpu_timers() from IRQ, it can be reaped by its parent or debugger right after unlock_task_sighand(). If a concurrent posix_cpu_timer_del() runs at that moment, it won't be able to detect timer->it.cpu.firing != 0: cpu_timer_task_rcu() and/or lock_task_sighand() will fail. Add the tsk->exit_state check into run_posix_cpu_timers() to fix this. This fix is not needed if CONFIG_POSIX_CPU_TIMERS_TASK_WORK=y, because exit_task_work() is called before exit_notify(). But the check still makes sense, task_work_add(&tsk->posix_cputimers_work.work) will fail anyway in this case.

Weakness classification

  • 134c704f-9b21-4f2e-91b3-4a467353bcc0: CWE-367

Primary references