8.8

CVE-2021-47324

watchdog: Fix possible use-after-free in wdt_startup()

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.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Linux ≫ Linux Kernel Version < 4.4.276
Linux ≫ Linux Kernel Version >= 4.5 < 4.9.276
Linux ≫ Linux Kernel Version >= 4.10 < 4.14.240
Linux ≫ Linux Kernel Version >= 4.15 < 4.19.198
Linux ≫ Linux Kernel Version >= 4.20 < 5.4.134
Linux ≫ Linux Kernel Version >= 5.5 < 5.10.52
Linux ≫ Linux Kernel Version >= 5.11 < 5.12.19
Linux ≫ Linux Kernel Version >= 5.13 < 5.13.4
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Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 1.16% 0.63
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
134c704f-9b21-4f2e-91b3-4a467353bcc0 8.8 2.8 5.9
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE-416 Use After Free

The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

https://git.kernel.org/stable/c/0ac50a76cf3cd63db000648b3b19f3f98b8aaa76
Patch
https://git.kernel.org/stable/c/146cc288fb80c662c9c35e7bc58325d1ac0a7875
Patch
https://git.kernel.org/stable/c/63a3dc24bd053792f84cb4eef0168b1266202a02
Patch
https://git.kernel.org/stable/c/862f2b5a7c38762ac9e369daefbf361a91aca685
Patch
https://git.kernel.org/stable/c/8adbbe6c86bb13e14f8a19e036ae5f4f5661fd90
Patch
https://git.kernel.org/stable/c/a397cb4576fc2fc802562418b3a50b8f67d60d31
Patch
https://git.kernel.org/stable/c/b4ebf4a4692e84163a69444c70ad515de06e2259
Patch
https://git.kernel.org/stable/c/c08a6b31e4917034f0ed0cb457c3bb209576f542
Patch
https://git.kernel.org/stable/c/dc9403097be52d57a5c9c35efa9be79d166a78af
Patch