CVE-2021-47384

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2021-47384
In the Linux kernel, the following vulnerability has been resolved: hwmon: (w83793) Fix NULL pointer dereference by removing unnecessary structure field If driver read tmp value sufficient for (tmp & 0x08) && (!(tmp & 0x80)) && ((tmp & 0x7) == ((tmp >> 4) & 0x7)) from device then Null pointer dereference occurs. (It is possible if tmp = 0b0xyz1xyz, where same literals mean same numbers) Also lm75[] does not serve a purpose anymore after switching to devm_i2c_new_dummy_device() in w83791d_detect_subclients(). The patch fixes possible NULL pointer dereference by removing lm75[]. Found by Linux Driver Verification project (linuxtesting.org). [groeck: Dropped unnecessary continuation lines, fixed multi-line alignments]

5.3 /10

CVSS v3 : MEDIUM

V3 Legend

Vector :

Exploitability : 3.9 / Impact : 1.4

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact LOW

Scope UNCHANGED

References
Link Resource
https://git.kernel.org/stable/c/6cb01fe630eaffc5a2c3f7364436caddba286623 Patch
https://git.kernel.org/stable/c/746011193f44f97f8784edcf8327c587946745fc Patch
https://git.kernel.org/stable/c/7c4fd5de39f273626a2b0f3a446d2cc85cd47616 Patch
https://git.kernel.org/stable/c/dd4d747ef05addab887dc8ff0d6ab9860bbcd783 Patch
https://git.kernel.org/stable/c/6cb01fe630eaffc5a2c3f7364436caddba286623 Patch
https://git.kernel.org/stable/c/746011193f44f97f8784edcf8327c587946745fc Patch
https://git.kernel.org/stable/c/7c4fd5de39f273626a2b0f3a446d2cc85cd47616 Patch
https://git.kernel.org/stable/c/dd4d747ef05addab887dc8ff0d6ab9860bbcd783 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:5.15:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.15:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.15:rc3:*:*:*:*:*:*
History

02 Apr 2025, 14:52

Type Values Removed Values Added
CPE cpe:2.3:o:linux:linux_kernel:5.15:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.15:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.15:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
First Time Linux linux Kernel
Linux
CWE CWE-476
References () https://git.kernel.org/stable/c/6cb01fe630eaffc5a2c3f7364436caddba286623 - () https://git.kernel.org/stable/c/6cb01fe630eaffc5a2c3f7364436caddba286623 - Patch
References () https://git.kernel.org/stable/c/746011193f44f97f8784edcf8327c587946745fc - () https://git.kernel.org/stable/c/746011193f44f97f8784edcf8327c587946745fc - Patch
References () https://git.kernel.org/stable/c/7c4fd5de39f273626a2b0f3a446d2cc85cd47616 - () https://git.kernel.org/stable/c/7c4fd5de39f273626a2b0f3a446d2cc85cd47616 - Patch
References () https://git.kernel.org/stable/c/dd4d747ef05addab887dc8ff0d6ab9860bbcd783 - () https://git.kernel.org/stable/c/dd4d747ef05addab887dc8ff0d6ab9860bbcd783 - Patch

21 Nov 2024, 06:36

Type Values Removed Values Added
References () https://git.kernel.org/stable/c/6cb01fe630eaffc5a2c3f7364436caddba286623 - () https://git.kernel.org/stable/c/6cb01fe630eaffc5a2c3f7364436caddba286623 -
References () https://git.kernel.org/stable/c/746011193f44f97f8784edcf8327c587946745fc - () https://git.kernel.org/stable/c/746011193f44f97f8784edcf8327c587946745fc -
References () https://git.kernel.org/stable/c/7c4fd5de39f273626a2b0f3a446d2cc85cd47616 - () https://git.kernel.org/stable/c/7c4fd5de39f273626a2b0f3a446d2cc85cd47616 -
References () https://git.kernel.org/stable/c/dd4d747ef05addab887dc8ff0d6ab9860bbcd783 - () https://git.kernel.org/stable/c/dd4d747ef05addab887dc8ff0d6ab9860bbcd783 -

06 Nov 2024, 19:35

Type Values Removed Values Added
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 5.3
Summary
  • (es) En el kernel de Linux, se resolvió la siguiente vulnerabilidad: hwmon: (w83793) Corrija la desreferencia del puntero NULL eliminando el campo de estructura innecesario. Si el controlador lee el valor tmp suficiente para (tmp & 0x08) && (!(tmp & 0x80)) && (( tmp & 0x7) == ((tmp >> 4) & 0x7)) desde el dispositivo, luego se produce la desreferencia del puntero null. (Es posible si tmp = 0b0xyz1xyz, donde los mismos literales significan los mismos números) Además, lm75[] ya no sirve para nada después de cambiar a devm_i2c_new_dummy_device() en w83791d_detect_subclients(). El parche corrige la posible desreferencia del puntero NULL eliminando lm75[]. Encontrado por el proyecto de verificación de controladores de Linux (linuxtesting.org). [groeck: Se eliminaron líneas de continuación innecesarias, se corrigieron alineaciones de varias líneas]

21 May 2024, 15:15

Type Values Removed Values Added
New CVE
Information

Published : 2024-05-21 15:15

Updated : 2025-04-02 14:52

NVD link : CVE-2021-47384

Mitre link : CVE-2021-47384

CVE.ORG link : CVE-2021-47384

JSON object : View

Products Affected

linux

  • linux_kernel
CWE
CWE-476

NULL Pointer Dereference