CVE-2026-31574

Summary

In the Linux kernel, the following vulnerability has been resolved:

clockevents: Add missing resets of the next_event_forced flag

The prevention mechanism against timer interrupt starvation missed to reset the next_event_forced flag in a couple of places:

- When the clock event state changes. That can cause the flag to be
  stale over a shutdown/startup sequence

- When a non-forced event is armed, which then prevents rearming before
  that event. If that event is far out in the future this will cause
  missed timer interrupts.

- In the suspend wakeup handler.

That led to stalls which have been reported by several people.

Add the missing resets, which fixes the problems for the reporters.

Affected Software

Weaknesses

References

• https://git.kernel.org/stable/c/9401b593fa48218d2667df1610b0ebc518554880
• https://git.kernel.org/stable/c/4096fd0e8eaea13ebe5206700b33f49635ae18e5

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