CVE-2025-68214 Affecting kernel-modules-extra package, versions *
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-CENTOS8-KERNELMODULESEXTRA-14515150
- published18 Dec 2025
- disclosed16 Dec 2025
Introduced: 16 Dec 2025
NewCVE-2025-68214 (opens in a new tab)How to fix?
There is no fixed version for Centos:8 kernel-modules-extra.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-modules-extra package and not the kernel-modules-extra package as distributed by Centos.
See How to fix? for Centos:8 relevant fixed versions and status.
In the Linux kernel, the following vulnerability has been resolved:
timers: Fix NULL function pointer race in timer_shutdown_sync()
There is a race condition between timer_shutdown_sync() and timer expiration that can lead to hitting a WARN_ON in expire_timers().
The issue occurs when timer_shutdown_sync() clears the timer function to NULL while the timer is still running on another CPU. The race scenario looks like this:
CPU0 CPU1 <SOFTIRQ> lock_timer_base() expire_timers() base->running_timer = timer; unlock_timer_base() [call_timer_fn enter] mod_timer() ... timer_shutdown_sync() lock_timer_base() // For now, will not detach the timer but only clear its function to NULL if (base->running_timer != timer) ret = detach_if_pending(timer, base, true); if (shutdown) timer->function = NULL; unlock_timer_base() [call_timer_fn exit] lock_timer_base() base->running_timer = NULL; unlock_timer_base() ... // Now timer is pending while its function set to NULL. // next timer trigger <SOFTIRQ> expire_timers() WARN_ON_ONCE(!fn) // hit ... lock_timer_base() // Now timer will detach if (base->running_timer != timer) ret = detach_if_pending(timer, base, true); if (shutdown) timer->function = NULL; unlock_timer_base()
The problem is that timer_shutdown_sync() clears the timer function regardless of whether the timer is currently running. This can leave a pending timer with a NULL function pointer, which triggers the WARN_ON_ONCE(!fn) check in expire_timers().
Fix this by only clearing the timer function when actually detaching the timer. If the timer is running, leave the function pointer intact, which is safe because the timer will be properly detached when it finishes running.
References
- https://access.redhat.com/security/cve/CVE-2025-68214
- https://git.kernel.org/stable/c/176725f4848376530a0f0da9023f956afcc33585
- https://git.kernel.org/stable/c/1a975716cc8977f461e45e28e3e5977d46ad7a6a
- https://git.kernel.org/stable/c/20739af07383e6eb1ec59dcd70b72ebfa9ac362c
- https://git.kernel.org/stable/c/6665fbd7730b26d770c232b20d1b907e6a67a914
- https://git.kernel.org/stable/c/a01efa7a780c42ac5170a949bd95c9786ffcc60a