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High severity7.8NVD Advisory· Published May 21, 2024· Updated Jun 17, 2026

CVE-2021-47321

CVE-2021-47321

Description

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

watchdog: Fix possible use-after-free by calling del_timer_sync()

This driver's remove path calls del_timer(). However, that function does not wait until the timer handler finishes. This means that the timer handler may still be running after the driver's remove function has finished, which would result in a use-after-free.

Fix by calling del_timer_sync(), which makes sure the timer handler has finished, and unable to re-schedule itself.

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Affected products

135

Patches

Vulnerability mechanics

References

9

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