watchdog: Fix possible use-after-free in wdt_startup()
21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 8.8epss 1.2%
exploitation probability
1.2%top 36% of all CVEs
observed exploitation
nono source reports it
In the Linux kernel, the following vulnerability has been resolved:
watchdog: Fix possible use-after-free in wdt_startup()
This module'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.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Affected products
Linux · LinuxReferences
https://git.kernel.org/stable/c/0ac50a76cf3cd63db000648b3b19f3f98b8aaa76https://git.kernel.org/stable/c/146cc288fb80c662c9c35e7bc58325d1ac0a7875https://git.kernel.org/stable/c/63a3dc24bd053792f84cb4eef0168b1266202a02https://git.kernel.org/stable/c/862f2b5a7c38762ac9e369daefbf361a91aca685https://git.kernel.org/stable/c/8adbbe6c86bb13e14f8a19e036ae5f4f5661fd90https://git.kernel.org/stable/c/a397cb4576fc2fc802562418b3a50b8f67d60d31https://git.kernel.org/stable/c/b4ebf4a4692e84163a69444c70ad515de06e2259https://git.kernel.org/stable/c/c08a6b31e4917034f0ed0cb457c3bb209576f542https://git.kernel.org/stable/c/dc9403097be52d57a5c9c35efa9be79d166a78af