CVE-2021-47500

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2021-47500
In the Linux kernel, the following vulnerability has been resolved: iio: mma8452: Fix trigger reference couting The mma8452 driver directly assigns a trigger to the struct iio_dev. The IIO core when done using this trigger will call `iio_trigger_put()` to drop the reference count by 1. Without the matching `iio_trigger_get()` in the driver the reference count can reach 0 too early, the trigger gets freed while still in use and a use-after-free occurs. Fix this by getting a reference to the trigger before assigning it to the IIO device.

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/094d513b78b1714113bc016684b8142382e071ba Patch
https://git.kernel.org/stable/c/794c0898f6bf39a458655d5fb4af70ec43a5cfcb Patch
https://git.kernel.org/stable/c/acf0088ac073ca6e7f4cad6acac112177e08df5e Patch
https://git.kernel.org/stable/c/c43517071dfc9fce34f8f69dbb98a86017f6b739 Patch
https://git.kernel.org/stable/c/cd0082235783f814241a1c9483fb89e405f4f892 Patch
https://git.kernel.org/stable/c/db12d95085367de8b0223929d1332731024441f1 Patch
https://git.kernel.org/stable/c/f5deab10ced368c807866283f8b79144c4823be8 Patch
https://git.kernel.org/stable/c/fb75cc4740d81264cd5bcb0e17d961d018a8be96 Patch
https://git.kernel.org/stable/c/094d513b78b1714113bc016684b8142382e071ba Patch
https://git.kernel.org/stable/c/794c0898f6bf39a458655d5fb4af70ec43a5cfcb Patch
https://git.kernel.org/stable/c/acf0088ac073ca6e7f4cad6acac112177e08df5e Patch
https://git.kernel.org/stable/c/c43517071dfc9fce34f8f69dbb98a86017f6b739 Patch
https://git.kernel.org/stable/c/cd0082235783f814241a1c9483fb89e405f4f892 Patch
https://git.kernel.org/stable/c/db12d95085367de8b0223929d1332731024441f1 Patch
https://git.kernel.org/stable/c/f5deab10ced368c807866283f8b79144c4823be8 Patch
https://git.kernel.org/stable/c/fb75cc4740d81264cd5bcb0e17d961d018a8be96 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:5.15:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.15:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.15:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.15:rc4:*:*:*:*:*:*
History

06 Jan 2025, 20:45

Type Values Removed Values Added
First Time Linux linux Kernel
Linux
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 7.8
References () https://git.kernel.org/stable/c/094d513b78b1714113bc016684b8142382e071ba - () https://git.kernel.org/stable/c/094d513b78b1714113bc016684b8142382e071ba - Patch
References () https://git.kernel.org/stable/c/794c0898f6bf39a458655d5fb4af70ec43a5cfcb - () https://git.kernel.org/stable/c/794c0898f6bf39a458655d5fb4af70ec43a5cfcb - Patch
References () https://git.kernel.org/stable/c/acf0088ac073ca6e7f4cad6acac112177e08df5e - () https://git.kernel.org/stable/c/acf0088ac073ca6e7f4cad6acac112177e08df5e - Patch
References () https://git.kernel.org/stable/c/c43517071dfc9fce34f8f69dbb98a86017f6b739 - () https://git.kernel.org/stable/c/c43517071dfc9fce34f8f69dbb98a86017f6b739 - Patch
References () https://git.kernel.org/stable/c/cd0082235783f814241a1c9483fb89e405f4f892 - () https://git.kernel.org/stable/c/cd0082235783f814241a1c9483fb89e405f4f892 - Patch
References () https://git.kernel.org/stable/c/db12d95085367de8b0223929d1332731024441f1 - () https://git.kernel.org/stable/c/db12d95085367de8b0223929d1332731024441f1 - Patch
References () https://git.kernel.org/stable/c/f5deab10ced368c807866283f8b79144c4823be8 - () https://git.kernel.org/stable/c/f5deab10ced368c807866283f8b79144c4823be8 - Patch
References () https://git.kernel.org/stable/c/fb75cc4740d81264cd5bcb0e17d961d018a8be96 - () https://git.kernel.org/stable/c/fb75cc4740d81264cd5bcb0e17d961d018a8be96 - Patch
CPE cpe:2.3:o:linux:linux_kernel:5.15:rc1:*:*:*:*:*:*
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:rc4:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.15:rc2:*:*:*:*:*:*
CWE CWE-416

21 Nov 2024, 06:36

Type Values Removed Values Added
References () https://git.kernel.org/stable/c/094d513b78b1714113bc016684b8142382e071ba - () https://git.kernel.org/stable/c/094d513b78b1714113bc016684b8142382e071ba -
References () https://git.kernel.org/stable/c/794c0898f6bf39a458655d5fb4af70ec43a5cfcb - () https://git.kernel.org/stable/c/794c0898f6bf39a458655d5fb4af70ec43a5cfcb -
References () https://git.kernel.org/stable/c/acf0088ac073ca6e7f4cad6acac112177e08df5e - () https://git.kernel.org/stable/c/acf0088ac073ca6e7f4cad6acac112177e08df5e -
References () https://git.kernel.org/stable/c/c43517071dfc9fce34f8f69dbb98a86017f6b739 - () https://git.kernel.org/stable/c/c43517071dfc9fce34f8f69dbb98a86017f6b739 -
References () https://git.kernel.org/stable/c/cd0082235783f814241a1c9483fb89e405f4f892 - () https://git.kernel.org/stable/c/cd0082235783f814241a1c9483fb89e405f4f892 -
References () https://git.kernel.org/stable/c/db12d95085367de8b0223929d1332731024441f1 - () https://git.kernel.org/stable/c/db12d95085367de8b0223929d1332731024441f1 -
References () https://git.kernel.org/stable/c/f5deab10ced368c807866283f8b79144c4823be8 - () https://git.kernel.org/stable/c/f5deab10ced368c807866283f8b79144c4823be8 -
References () https://git.kernel.org/stable/c/fb75cc4740d81264cd5bcb0e17d961d018a8be96 - () https://git.kernel.org/stable/c/fb75cc4740d81264cd5bcb0e17d961d018a8be96 -
Summary
  • (es) En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: iio: mma8452: corrección del cálculo de referencia del disparador El controlador mma8452 asigna directamente un disparador a la estructura iio_dev. El núcleo de IIO, cuando termine de usar este activador, llamará a `iio_trigger_put()` para reducir el recuento de referencias en 1. Sin el `iio_trigger_get()` coincidente en el controlador, el recuento de referencias puede llegar a 0 demasiado pronto, el activador se libera mientras aún está en se produce un uso y un use-after-free. Solucione este problema obteniendo una referencia al disparador antes de asignarlo al dispositivo IIO.

24 May 2024, 15:15

Type Values Removed Values Added
New CVE
Information

Published : 2024-05-24 15:15

Updated : 2025-01-06 20:45

NVD link : CVE-2021-47500

Mitre link : CVE-2021-47500

CVE.ORG link : CVE-2021-47500

JSON object : View

Products Affected

linux

  • linux_kernel
CWE
CWE-416

Use After Free