CVE-2021-47324

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2021-47324
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.

8.8 /10

CVSS v3 : HIGH

V3 Legend

Vector :

Exploitability : 2.8 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References
Link Resource
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
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
Configurations

Configuration 1 (hide)

OR cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
History

02 Apr 2025, 14:39

Type Values Removed Values Added
References () https://git.kernel.org/stable/c/0ac50a76cf3cd63db000648b3b19f3f98b8aaa76 - () https://git.kernel.org/stable/c/0ac50a76cf3cd63db000648b3b19f3f98b8aaa76 - Patch
References () https://git.kernel.org/stable/c/146cc288fb80c662c9c35e7bc58325d1ac0a7875 - () https://git.kernel.org/stable/c/146cc288fb80c662c9c35e7bc58325d1ac0a7875 - Patch
References () https://git.kernel.org/stable/c/63a3dc24bd053792f84cb4eef0168b1266202a02 - () https://git.kernel.org/stable/c/63a3dc24bd053792f84cb4eef0168b1266202a02 - Patch
References () https://git.kernel.org/stable/c/862f2b5a7c38762ac9e369daefbf361a91aca685 - () https://git.kernel.org/stable/c/862f2b5a7c38762ac9e369daefbf361a91aca685 - Patch
References () https://git.kernel.org/stable/c/8adbbe6c86bb13e14f8a19e036ae5f4f5661fd90 - () https://git.kernel.org/stable/c/8adbbe6c86bb13e14f8a19e036ae5f4f5661fd90 - Patch
References () https://git.kernel.org/stable/c/a397cb4576fc2fc802562418b3a50b8f67d60d31 - () https://git.kernel.org/stable/c/a397cb4576fc2fc802562418b3a50b8f67d60d31 - Patch
References () https://git.kernel.org/stable/c/b4ebf4a4692e84163a69444c70ad515de06e2259 - () https://git.kernel.org/stable/c/b4ebf4a4692e84163a69444c70ad515de06e2259 - Patch
References () https://git.kernel.org/stable/c/c08a6b31e4917034f0ed0cb457c3bb209576f542 - () https://git.kernel.org/stable/c/c08a6b31e4917034f0ed0cb457c3bb209576f542 - Patch
References () https://git.kernel.org/stable/c/dc9403097be52d57a5c9c35efa9be79d166a78af - () https://git.kernel.org/stable/c/dc9403097be52d57a5c9c35efa9be79d166a78af - Patch
First Time Linux linux Kernel
Linux
CPE cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

21 Nov 2024, 06:35

Type Values Removed Values Added
References () https://git.kernel.org/stable/c/0ac50a76cf3cd63db000648b3b19f3f98b8aaa76 - () https://git.kernel.org/stable/c/0ac50a76cf3cd63db000648b3b19f3f98b8aaa76 -
References () https://git.kernel.org/stable/c/146cc288fb80c662c9c35e7bc58325d1ac0a7875 - () https://git.kernel.org/stable/c/146cc288fb80c662c9c35e7bc58325d1ac0a7875 -
References () https://git.kernel.org/stable/c/63a3dc24bd053792f84cb4eef0168b1266202a02 - () https://git.kernel.org/stable/c/63a3dc24bd053792f84cb4eef0168b1266202a02 -
References () https://git.kernel.org/stable/c/862f2b5a7c38762ac9e369daefbf361a91aca685 - () https://git.kernel.org/stable/c/862f2b5a7c38762ac9e369daefbf361a91aca685 -
References () https://git.kernel.org/stable/c/8adbbe6c86bb13e14f8a19e036ae5f4f5661fd90 - () https://git.kernel.org/stable/c/8adbbe6c86bb13e14f8a19e036ae5f4f5661fd90 -
References () https://git.kernel.org/stable/c/a397cb4576fc2fc802562418b3a50b8f67d60d31 - () https://git.kernel.org/stable/c/a397cb4576fc2fc802562418b3a50b8f67d60d31 -
References () https://git.kernel.org/stable/c/b4ebf4a4692e84163a69444c70ad515de06e2259 - () https://git.kernel.org/stable/c/b4ebf4a4692e84163a69444c70ad515de06e2259 -
References () https://git.kernel.org/stable/c/c08a6b31e4917034f0ed0cb457c3bb209576f542 - () https://git.kernel.org/stable/c/c08a6b31e4917034f0ed0cb457c3bb209576f542 -
References () https://git.kernel.org/stable/c/dc9403097be52d57a5c9c35efa9be79d166a78af - () https://git.kernel.org/stable/c/dc9403097be52d57a5c9c35efa9be79d166a78af -

03 Jul 2024, 01:37

Type Values Removed Values Added
Summary
  • (es) En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: perro guardián: soluciona el posible use after free en wdt_startup(). La ruta de eliminación de este módulo llama a del_timer(). Sin embargo, esa función no espera hasta que finalice el controlador del temporizador. Esto significa que es posible que el controlador del temporizador aún esté ejecutándose después de que haya finalizado la función de eliminación del controlador, lo que daría como resultado un use after free. Para solucionarlo, llame a del_timer_sync(), lo que garantiza que el controlador del temporizador haya finalizado y no pueda reprogramarse.
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 8.8
CWE CWE-416

21 May 2024, 15:15

Type Values Removed Values Added
New CVE
Information

Published : 2024-05-21 15:15

Updated : 2025-04-02 14:39

NVD link : CVE-2021-47324

Mitre link : CVE-2021-47324

CVE.ORG link : CVE-2021-47324

JSON object : View

Products Affected

linux

  • linux_kernel
CWE
CWE-416

Use After Free