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CVE-2025-68214 is a race condition in the Linux kernel timer subsystem involving timer_shutdown_sync(). The bug occurs when timer_shutdown_sync() clears timer->function to NULL even though the timer is still executing on another CPU. In the described sequence, expire_timers() has already selected the timer as base->running_timer and released the timer base lock before invoking the callback path. While that callback is still in progress, another CPU enters timer_shutdown_sync(), observes shutdown state, and clears the timer function pointer without detaching the timer if it is currently running. If the running callback re-arms the timer via mod_timer(), the timer can remain pending with a NULL callback. On the next expiration, expire_timers() encounters the pending timer and hits WARN_ON_ONCE(!fn). The fix is to clear the timer function pointer only when the timer is actually detached; if the timer is still running, the function pointer must remain intact until the timer completes and can be safely detached.
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Cross-references every affected SKU, including bundled OEM variants.
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