CVE-2021-47324 | BDVDB-2026-236759 Detail
LinuxLinux
Description#
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.
Impact#
Per CVSS v3.1: confidentiality impact high, integrity impact high, availability impact high. Attack vector: network.
Weaknesses#
- CWE-416 Use After Free
References#
- https://git.kernel.org/stable/c/63a3dc24bd053792f84cb4eef0168b1266202a02
- https://git.kernel.org/stable/c/862f2b5a7c38762ac9e369daefbf361a91aca685
- https://git.kernel.org/stable/c/0ac50a76cf3cd63db000648b3b19f3f98b8aaa76
- https://git.kernel.org/stable/c/dc9403097be52d57a5c9c35efa9be79d166a78af
- https://git.kernel.org/stable/c/146cc288fb80c662c9c35e7bc58325d1ac0a7875
- https://git.kernel.org/stable/c/a397cb4576fc2fc802562418b3a50b8f67d60d31
- https://git.kernel.org/stable/c/b4ebf4a4692e84163a69444c70ad515de06e2259
- https://git.kernel.org/stable/c/8adbbe6c86bb13e14f8a19e036ae5f4f5661fd90
- https://git.kernel.org/stable/c/c08a6b31e4917034f0ed0cb457c3bb209576f542
Exploit#
No public exploit known
History#
- Version 1Record published in the CVE List.
- Version 2Most recent update recorded in the CVE List.