CVE-2021-47323

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2021-47323
In the Linux kernel, the following vulnerability has been resolved: watchdog: sc520_wdt: Fix possible use-after-free in wdt_turnoff() 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/0015581a79bbf8e521f85dddb7d3e4a66b9f51d4 Patch
https://git.kernel.org/stable/c/2aef07017fae21c3d8acea9656b10e3b9c0f1e04 Patch
https://git.kernel.org/stable/c/522e75ed63f67e815d4ec0deace67df22d9ce78e Patch
https://git.kernel.org/stable/c/7c56c5508dc20a6b133bc669fc34327a6711c24c Patch
https://git.kernel.org/stable/c/90b7c141132244e8e49a34a4c1e445cce33e07f4 Patch
https://git.kernel.org/stable/c/a173e3b62cf6dd3c4a0a10c8a82eedfcae81a566 Patch
https://git.kernel.org/stable/c/b3c41ea5bc34d8c7b19e230d80e0e555c6f5057d Patch
https://git.kernel.org/stable/c/b4565a8a2d6bffb05bfbec11399d261ec16fe373 Patch
https://git.kernel.org/stable/c/f0feab82f6a0323f54d85e8b512a2be64f83648a Patch
https://git.kernel.org/stable/c/0015581a79bbf8e521f85dddb7d3e4a66b9f51d4 Patch
https://git.kernel.org/stable/c/2aef07017fae21c3d8acea9656b10e3b9c0f1e04 Patch
https://git.kernel.org/stable/c/522e75ed63f67e815d4ec0deace67df22d9ce78e Patch
https://git.kernel.org/stable/c/7c56c5508dc20a6b133bc669fc34327a6711c24c Patch
https://git.kernel.org/stable/c/90b7c141132244e8e49a34a4c1e445cce33e07f4 Patch
https://git.kernel.org/stable/c/a173e3b62cf6dd3c4a0a10c8a82eedfcae81a566 Patch
https://git.kernel.org/stable/c/b3c41ea5bc34d8c7b19e230d80e0e555c6f5057d Patch
https://git.kernel.org/stable/c/b4565a8a2d6bffb05bfbec11399d261ec16fe373 Patch
https://git.kernel.org/stable/c/f0feab82f6a0323f54d85e8b512a2be64f83648a 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, 14:40

Type Values Removed Values Added
First Time Linux linux Kernel
Linux
References () https://git.kernel.org/stable/c/0015581a79bbf8e521f85dddb7d3e4a66b9f51d4 - () https://git.kernel.org/stable/c/0015581a79bbf8e521f85dddb7d3e4a66b9f51d4 - Patch
References () https://git.kernel.org/stable/c/2aef07017fae21c3d8acea9656b10e3b9c0f1e04 - () https://git.kernel.org/stable/c/2aef07017fae21c3d8acea9656b10e3b9c0f1e04 - Patch
References () https://git.kernel.org/stable/c/522e75ed63f67e815d4ec0deace67df22d9ce78e - () https://git.kernel.org/stable/c/522e75ed63f67e815d4ec0deace67df22d9ce78e - Patch
References () https://git.kernel.org/stable/c/7c56c5508dc20a6b133bc669fc34327a6711c24c - () https://git.kernel.org/stable/c/7c56c5508dc20a6b133bc669fc34327a6711c24c - Patch
References () https://git.kernel.org/stable/c/90b7c141132244e8e49a34a4c1e445cce33e07f4 - () https://git.kernel.org/stable/c/90b7c141132244e8e49a34a4c1e445cce33e07f4 - Patch
References () https://git.kernel.org/stable/c/a173e3b62cf6dd3c4a0a10c8a82eedfcae81a566 - () https://git.kernel.org/stable/c/a173e3b62cf6dd3c4a0a10c8a82eedfcae81a566 - Patch
References () https://git.kernel.org/stable/c/b3c41ea5bc34d8c7b19e230d80e0e555c6f5057d - () https://git.kernel.org/stable/c/b3c41ea5bc34d8c7b19e230d80e0e555c6f5057d - Patch
References () https://git.kernel.org/stable/c/b4565a8a2d6bffb05bfbec11399d261ec16fe373 - () https://git.kernel.org/stable/c/b4565a8a2d6bffb05bfbec11399d261ec16fe373 - Patch
References () https://git.kernel.org/stable/c/f0feab82f6a0323f54d85e8b512a2be64f83648a - () https://git.kernel.org/stable/c/f0feab82f6a0323f54d85e8b512a2be64f83648a - Patch
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/0015581a79bbf8e521f85dddb7d3e4a66b9f51d4 - () https://git.kernel.org/stable/c/0015581a79bbf8e521f85dddb7d3e4a66b9f51d4 -
References () https://git.kernel.org/stable/c/2aef07017fae21c3d8acea9656b10e3b9c0f1e04 - () https://git.kernel.org/stable/c/2aef07017fae21c3d8acea9656b10e3b9c0f1e04 -
References () https://git.kernel.org/stable/c/522e75ed63f67e815d4ec0deace67df22d9ce78e - () https://git.kernel.org/stable/c/522e75ed63f67e815d4ec0deace67df22d9ce78e -
References () https://git.kernel.org/stable/c/7c56c5508dc20a6b133bc669fc34327a6711c24c - () https://git.kernel.org/stable/c/7c56c5508dc20a6b133bc669fc34327a6711c24c -
References () https://git.kernel.org/stable/c/90b7c141132244e8e49a34a4c1e445cce33e07f4 - () https://git.kernel.org/stable/c/90b7c141132244e8e49a34a4c1e445cce33e07f4 -
References () https://git.kernel.org/stable/c/a173e3b62cf6dd3c4a0a10c8a82eedfcae81a566 - () https://git.kernel.org/stable/c/a173e3b62cf6dd3c4a0a10c8a82eedfcae81a566 -
References () https://git.kernel.org/stable/c/b3c41ea5bc34d8c7b19e230d80e0e555c6f5057d - () https://git.kernel.org/stable/c/b3c41ea5bc34d8c7b19e230d80e0e555c6f5057d -
References () https://git.kernel.org/stable/c/b4565a8a2d6bffb05bfbec11399d261ec16fe373 - () https://git.kernel.org/stable/c/b4565a8a2d6bffb05bfbec11399d261ec16fe373 -
References () https://git.kernel.org/stable/c/f0feab82f6a0323f54d85e8b512a2be64f83648a - () https://git.kernel.org/stable/c/f0feab82f6a0323f54d85e8b512a2be64f83648a -

03 Jul 2024, 01:37

Type Values Removed Values Added
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 8.8
CWE CWE-416
Summary
  • (es) En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: watchdog: sc520_wdt: corrige posible use after free en wdt_turnoff(). 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.

21 May 2024, 15:15

Type Values Removed Values Added
New CVE
Information

Published : 2024-05-21 15:15

Updated : 2025-04-02 14:40

NVD link : CVE-2021-47323

Mitre link : CVE-2021-47323

CVE.ORG link : CVE-2021-47323

JSON object : View

Products Affected

linux

  • linux_kernel
CWE
CWE-416

Use After Free