watchdog: cpu5wdt.c: Fix use-after-free bug caused by cpu5wdt_trigger

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In the Linux kernel, the following vulnerability has been resolved: watchdog: cpu5wdt.c: Fix use-after-free bug caused by cpu5wdt_trigger When the cpu5wdt module is removing, the origin code uses del_timer() to de-activate the timer. If the timer handler is running, del_timer() could not stop it and will return directly. If the port region is released by release_region() and then the timer handler cpu5wdt_trigger() calls outb() to write into the region that is released, the use-after-free bug will happen. Change del_timer() to timer_shutdown_sync() in order that the timer handler could be finished before the port region is released.

Source published

21 Jun 2024 10:18:20 UTC

Source modified

30 Oct 2026 12:18:35 UTC

Observed here

30 Oct 2026 13:45:33 UTC

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