Description
In the Linux kernel, the following vulnerability has been resolved:
posix-timers: Prevent RT livelock in itimer_delete()
itimer_delete() has a retry loop when the timer is concurrently expired. On non-RT kernels this just spin-waits until the timer callback has completed, except for posix CPU timers which have HAVE_POSIX_CPU_TIMERS_TASK_WORK enabled.
In that case and on RT kernels the existing task could live lock when preempting the task which does the timer delivery.
Replace spin_unlock() with an invocation of timer_wait_running() to handle it the same way as the other retry loops in the posix timer code.
Metrics
No CVSS score has been published yet.
Affected software
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | >= ec8f954a40da8cd3d159713b608e901f0cd909a9, < f1be1ed32daa053484222f7f9beb2b16c624dffd; >= ec8f954a40da8cd3d159713b608e901f0cd909a9, < 0670c4c567b27bd8f999a943028f4fe60d1a1106; >= ec8f954a40da8cd3d159713b608e901f0cd909a9, < e7aff15ba29ba4b3052786b1636fa5c4aa39e179; >= ec8f954a40da8cd3d159713b608e901f0cd909a9, < f9bd298e3e4d3fd6e19f017789a42d0f332cd555; >= ec8f954a40da8cd3d159713b608e901f0cd909a9, < c1968bb8a28625cc95d2ad3ca872ab98c9c36d59; >= ec8f954a40da8cd3d159713b608e901f0cd909a9, < 9d9e522010eb5685d8b53e8a24320653d9d4cbbf |
| Linux | Linux | 5.4 |
References
- https://git.kernel.org/stable/c/0670c4c567b27bd8f999a943028f4fe60d1a1106
- https://git.kernel.org/stable/c/9d9e522010eb5685d8b53e8a24320653d9d4cbbf
- https://git.kernel.org/stable/c/c1968bb8a28625cc95d2ad3ca872ab98c9c36d59
- https://git.kernel.org/stable/c/e7aff15ba29ba4b3052786b1636fa5c4aa39e179
- https://git.kernel.org/stable/c/f1be1ed32daa053484222f7f9beb2b16c624dffd
- https://git.kernel.org/stable/c/f9bd298e3e4d3fd6e19f017789a42d0f332cd555
Timeline
- Published
- Dec 9, 2025
- Last modified
- Jun 17, 2026
- NVD status
- Deferred