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.
Metrics
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HWeakness enumeration
Affected software
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | >= 0bdd2ed4138ec04e09b4f8165981efc99e439f55, < 78a4b8e3795b31dae58762bc091bb0f4f74a2200; >= 0bdd2ed4138ec04e09b4f8165981efc99e439f55, < c076635b3a42771ace7d276de8dc3bc76ee2ba1b; >= 0bdd2ed4138ec04e09b4f8165981efc99e439f55, < 2f3daa04a9328220de46f0d5c919a6c0073a9f0b; >= 0bdd2ed4138ec04e09b4f8165981efc99e439f55, < 764a7a5dfda23f69919441f2eac2a83e7db6e5bb; >= 0bdd2ed4138ec04e09b4f8165981efc99e439f55, < 2c72fe18cc5f9f1750f5bc148cf1c94c29e106ff; >= 0bdd2ed4138ec04e09b4f8165981efc99e439f55, < c29d5318708e67ac13c1b6fc1007d179fb65b4d7; >= 0bdd2ed4138ec04e09b4f8165981efc99e439f55, < 460188bc042a3f40f72d34b9f7fc6ee66b0b757b; >= 0bdd2ed4138ec04e09b4f8165981efc99e439f55, < f90fff1e152dedf52b932240ebbd670d83330eca |
| Linux | Linux | 2.6.36 |
References
- https://git.kernel.org/stable/c/2c72fe18cc5f9f1750f5bc148cf1c94c29e106ffPatch
- https://git.kernel.org/stable/c/2f3daa04a9328220de46f0d5c919a6c0073a9f0bPatch
- https://git.kernel.org/stable/c/460188bc042a3f40f72d34b9f7fc6ee66b0b757bPatch
- https://git.kernel.org/stable/c/764a7a5dfda23f69919441f2eac2a83e7db6e5bbPatch
- https://git.kernel.org/stable/c/78a4b8e3795b31dae58762bc091bb0f4f74a2200Patch
- https://git.kernel.org/stable/c/c076635b3a42771ace7d276de8dc3bc76ee2ba1bPatch
- https://git.kernel.org/stable/c/c29d5318708e67ac13c1b6fc1007d179fb65b4d7Patch
- https://git.kernel.org/stable/c/f90fff1e152dedf52b932240ebbd670d83330ecaPatch
- https://lists.debian.org/debian-lts-announce/2025/10/msg00007.htmlMailing List, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2025/10/msg00008.htmlMailing List, Third Party Advisory
- https://github.com/farazsth98/chronomalyExploit
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-38352US Government Resource
Timeline
- Published
- Jul 22, 2025
- Last modified
- Sep 8, 2026
- Added to CISA KEV
- Sep 4, 2025
- NVD status
- Analyzed