CVE-2021-47471

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2021-47471
In the Linux kernel, the following vulnerability has been resolved: drm: mxsfb: Fix NULL pointer dereference crash on unload The mxsfb->crtc.funcs may already be NULL when unloading the driver, in which case calling mxsfb_irq_disable() via drm_irq_uninstall() from mxsfb_unload() leads to NULL pointer dereference. Since all we care about is masking the IRQ and mxsfb->base is still valid, just use that to clear and mask the IRQ.

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/3cfc183052c3dbf8eae57b6c1685dab00ed3db4a Patch
https://git.kernel.org/stable/c/b0e6db0656ddfd8bb57303c2ef61ee1c1cc694a8 Patch
https://git.kernel.org/stable/c/f40c2281d2c0674d32ba732fee45222d76495472 Patch
https://git.kernel.org/stable/c/3cfc183052c3dbf8eae57b6c1685dab00ed3db4a Patch
https://git.kernel.org/stable/c/b0e6db0656ddfd8bb57303c2ef61ee1c1cc694a8 Patch
https://git.kernel.org/stable/c/f40c2281d2c0674d32ba732fee45222d76495472 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: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:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.15:rc5:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.15:rc6:*:*:*:*:*:*
History

02 Apr 2025, 15:10

Type Values Removed Values Added
CPE cpe:2.3:o:linux:linux_kernel:5.15:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.15:rc6:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.15:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.15:rc4:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.15:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.15:rc5:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
First Time Linux linux Kernel
Linux
References () https://git.kernel.org/stable/c/3cfc183052c3dbf8eae57b6c1685dab00ed3db4a - () https://git.kernel.org/stable/c/3cfc183052c3dbf8eae57b6c1685dab00ed3db4a - Patch
References () https://git.kernel.org/stable/c/b0e6db0656ddfd8bb57303c2ef61ee1c1cc694a8 - () https://git.kernel.org/stable/c/b0e6db0656ddfd8bb57303c2ef61ee1c1cc694a8 - Patch
References () https://git.kernel.org/stable/c/f40c2281d2c0674d32ba732fee45222d76495472 - () https://git.kernel.org/stable/c/f40c2281d2c0674d32ba732fee45222d76495472 - Patch

21 Nov 2024, 06:36

Type Values Removed Values Added
References () https://git.kernel.org/stable/c/3cfc183052c3dbf8eae57b6c1685dab00ed3db4a - () https://git.kernel.org/stable/c/3cfc183052c3dbf8eae57b6c1685dab00ed3db4a -
References () https://git.kernel.org/stable/c/b0e6db0656ddfd8bb57303c2ef61ee1c1cc694a8 - () https://git.kernel.org/stable/c/b0e6db0656ddfd8bb57303c2ef61ee1c1cc694a8 -
References () https://git.kernel.org/stable/c/f40c2281d2c0674d32ba732fee45222d76495472 - () https://git.kernel.org/stable/c/f40c2281d2c0674d32ba732fee45222d76495472 -

31 Oct 2024, 16:35

Type Values Removed Values Added
Summary
  • (es) En el kernel de Linux, se resolvió la siguiente vulnerabilidad: drm: mxsfb: corrige el fallo de desreferencia del puntero NULL al descargar Es posible que mxsfb->crtc.funcs ya sea NULL al descargar el controlador, en cuyo caso se llama a mxsfb_irq_disable() a través de drm_irq_uninstall() desde mxsfb_unload() conduce a la desreferencia del puntero NULL. Dado que lo único que nos importa es enmascarar la IRQ y mxsfb->base sigue siendo válido, simplemente utilícelo para borrar y enmascarar la IRQ.
CWE CWE-476
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 5.5

22 May 2024, 07:15

Type Values Removed Values Added
New CVE
Information

Published : 2024-05-22 07:15

Updated : 2025-04-02 15:10

NVD link : CVE-2021-47471

Mitre link : CVE-2021-47471

CVE.ORG link : CVE-2021-47471

JSON object : View

Products Affected

linux

  • linux_kernel
CWE
CWE-476

NULL Pointer Dereference