CVE-2021-47385

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2021-47385
In the Linux kernel, the following vulnerability has been resolved: hwmon: (w83792d) 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 multipline alignment]

5.5 /10

CVSS v3 : MEDIUM

V3 Legend

Vector :

Exploitability : 1.8 / Impact : 3.6

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References
Link Resource
https://git.kernel.org/stable/c/0f36b88173f028e372668ae040ab1a496834d278 Patch
https://git.kernel.org/stable/c/1499bb2c3a87a2efea0065adab2bd66badee61c3 Patch
https://git.kernel.org/stable/c/200ced5ba724d8bbf29dfac4ed1e17a39ccaccd1 Patch
https://git.kernel.org/stable/c/24af1fe376e22c42238a4a604d31e46c486876c3 Patch
https://git.kernel.org/stable/c/0f36b88173f028e372668ae040ab1a496834d278 Patch
https://git.kernel.org/stable/c/1499bb2c3a87a2efea0065adab2bd66badee61c3 Patch
https://git.kernel.org/stable/c/200ced5ba724d8bbf29dfac4ed1e17a39ccaccd1 Patch
https://git.kernel.org/stable/c/24af1fe376e22c42238a4a604d31e46c486876c3 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

23 Dec 2024, 21:01

Type Values Removed Values Added
References () https://git.kernel.org/stable/c/0f36b88173f028e372668ae040ab1a496834d278 - () https://git.kernel.org/stable/c/0f36b88173f028e372668ae040ab1a496834d278 - Patch
References () https://git.kernel.org/stable/c/1499bb2c3a87a2efea0065adab2bd66badee61c3 - () https://git.kernel.org/stable/c/1499bb2c3a87a2efea0065adab2bd66badee61c3 - Patch
References () https://git.kernel.org/stable/c/200ced5ba724d8bbf29dfac4ed1e17a39ccaccd1 - () https://git.kernel.org/stable/c/200ced5ba724d8bbf29dfac4ed1e17a39ccaccd1 - Patch
References () https://git.kernel.org/stable/c/24af1fe376e22c42238a4a604d31e46c486876c3 - () https://git.kernel.org/stable/c/24af1fe376e22c42238a4a604d31e46c486876c3 - Patch
CPE cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
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:5.15:rc1:*:*:*:*:*:*
CWE CWE-476
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 5.5
First Time Linux linux Kernel
Linux

21 Nov 2024, 06:36

Type Values Removed Values Added
Summary
  • (es) En el kernel de Linux, se resolvió la siguiente vulnerabilidad: hwmon: (w83792d) 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 multilínea]
References () https://git.kernel.org/stable/c/0f36b88173f028e372668ae040ab1a496834d278 - () https://git.kernel.org/stable/c/0f36b88173f028e372668ae040ab1a496834d278 -
References () https://git.kernel.org/stable/c/1499bb2c3a87a2efea0065adab2bd66badee61c3 - () https://git.kernel.org/stable/c/1499bb2c3a87a2efea0065adab2bd66badee61c3 -
References () https://git.kernel.org/stable/c/200ced5ba724d8bbf29dfac4ed1e17a39ccaccd1 - () https://git.kernel.org/stable/c/200ced5ba724d8bbf29dfac4ed1e17a39ccaccd1 -
References () https://git.kernel.org/stable/c/24af1fe376e22c42238a4a604d31e46c486876c3 - () https://git.kernel.org/stable/c/24af1fe376e22c42238a4a604d31e46c486876c3 -

21 May 2024, 15:15

Type Values Removed Values Added
New CVE
Information

Published : 2024-05-21 15:15

Updated : 2024-12-23 21:01

NVD link : CVE-2021-47385

Mitre link : CVE-2021-47385

CVE.ORG link : CVE-2021-47385

JSON object : View

Products Affected

linux

  • linux_kernel
CWE
CWE-476

NULL Pointer Dereference