CVE-2021-47386

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2021-47386
In the Linux kernel, the following vulnerability has been resolved: hwmon: (w83791d) Fix NULL pointer dereference by removing unnecessary structure field If driver read val value sufficient for (val & 0x08) && (!(val & 0x80)) && ((val & 0x7) == ((val >> 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 alignment]

7.8 /10

CVSS v3 : HIGH

V3 Legend

Vector :

Exploitability : 1.8 / Impact : 5.9

Attack Vector LOCAL

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/16887ae4e3defd2c4e7913b6c539f33eaf4eac5c
https://git.kernel.org/stable/c/44d3c480e4e2a75bf6296a18b4356157991ccd80
https://git.kernel.org/stable/c/516d9055039017a20a698103be2b556b4c976bb8
https://git.kernel.org/stable/c/943c15ac1b84d378da26bba41c83c67e16499ac4
Configurations

No configuration.

History

13 Nov 2024, 19:35

Type Values Removed Values Added
CWE CWE-476
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 7.8
Summary
  • (es) En el kernel de Linux, se resolvió la siguiente vulnerabilidad: hwmon: (w83791d) Corrija la desreferencia del puntero NULL eliminando el campo de estructura innecesario. Si el controlador lee el valor val suficiente para (val & 0x08) && (!(val & 0x80)) && (( val & 0x7) == ((val >> 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 corrigió la alineación de varias líneas]

21 May 2024, 15:15

Type Values Removed Values Added
New CVE
Information

Published : 2024-05-21 15:15

Updated : 2024-11-13 19:35

NVD link : CVE-2021-47386

Mitre link : CVE-2021-47386

CVE.ORG link : CVE-2021-47386

JSON object : View

Products Affected

No product.

CWE
CWE-476

NULL Pointer Dereference