CVE-2025-38352
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.
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.
Vendor
Product
CWE
Yayın Tarihi
2025-07-22 08:15:23
Güncelleme
2026-01-08 16:28:23
Source Identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
KEV Date Added
2025-09-04
Kategoriler
Referanslar
https://git.kernel.org/stable/c/2c72fe18cc5f9f1750f5bc148cf1c94c29e106ff
https://git.kernel.org/stable/c/2f3daa04a9328220de46f0d5c919a6c0073a9f0b
https://git.kernel.org/stable/c/460188bc042a3f40f72d34b9f7fc6ee66b0b757b
https://git.kernel.org/stable/c/764a7a5dfda23f69919441f2eac2a83e7db6e5bb
https://git.kernel.org/stable/c/78a4b8e3795b31dae58762bc091bb0f4f74a2200
https://git.kernel.org/stable/c/c076635b3a42771ace7d276de8dc3bc76ee2ba1b
https://git.kernel.org/stable/c/c29d5318708e67ac13c1b6fc1007d179fb65b4d7
https://git.kernel.org/stable/c/f90fff1e152dedf52b932240ebbd670d83330eca
https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html
https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html
https://github.com/farazsth98/chronomaly
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-38352