UBUNTU-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.
02 / AFFECTED SOFTWARE
Affected packages
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157 explicit affected versions
10 explicit affected versions
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1 explicit affected versions
59 explicit affected versions
114 explicit affected versions
6 explicit affected versions
26 explicit affected versions
62 explicit affected versions
03 / CONNECTIONS
Connected vulnerabilities
04 / EVIDENCE
Source records
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.
05 / REFERENCES
Further evidence
- https://git.kernel.org/linus/f90fff1e152dedf52b932240ebbd670d83330eca
- 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://ubuntu.com/security/CVE-2025-38352
- https://ubuntu.com/security/notices/USN-7769-1
- https://ubuntu.com/security/notices/USN-7769-2
- https://ubuntu.com/security/notices/USN-7769-3
- https://ubuntu.com/security/notices/USN-7770-1
- https://ubuntu.com/security/notices/USN-7771-1
- https://ubuntu.com/security/notices/USN-7774-1
- https://ubuntu.com/security/notices/USN-7774-2
- https://ubuntu.com/security/notices/USN-7774-3
- https://ubuntu.com/security/notices/USN-7774-4
- https://ubuntu.com/security/notices/USN-7774-5
- https://ubuntu.com/security/notices/USN-7775-1
- https://ubuntu.com/security/notices/USN-7775-2
- https://ubuntu.com/security/notices/USN-7775-3
- https://ubuntu.com/security/notices/USN-7776-1
- https://ubuntu.com/security/notices/USN-7789-1
- https://ubuntu.com/security/notices/USN-7789-2
- https://ubuntu.com/security/notices/USN-7853-1
- https://ubuntu.com/security/notices/USN-7853-2
- https://ubuntu.com/security/notices/USN-7853-3
- https://ubuntu.com/security/notices/USN-7854-1
- https://ubuntu.com/security/notices/USN-7861-1
- https://ubuntu.com/security/notices/USN-7861-2
- https://ubuntu.com/security/notices/USN-7861-3
- https://ubuntu.com/security/notices/USN-7861-5
- https://ubuntu.com/security/notices/USN-7863-1
- https://ubuntu.com/security/notices/USN-7864-1
- https://ubuntu.com/security/notices/USN-7865-1
- https://ubuntu.com/security/notices/USN-7874-1
- https://ubuntu.com/security/notices/USN-7874-2
- https://ubuntu.com/security/notices/USN-7874-3
- https://ubuntu.com/security/notices/USN-7935-1
- https://ubuntu.com/security/notices/USN-7937-1
- https://ubuntu.com/security/notices/USN-7939-1
- https://ubuntu.com/security/notices/USN-7939-2
- https://ubuntu.com/security/notices/USN-7940-1
- https://ubuntu.com/security/notices/USN-7940-2
- https://ubuntu.com/security/notices/USN-7986-1
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog
- https://www.cve.org/CVERecord?id=CVE-2025-38352