CVE-2021-47444

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  2. Vulnerabilities (CVE)
  3. CVE-2021-47444

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

I

n the Linux kernel, the following vulnerability has been resolved: drm/edid: In connector_bad_edid() cap num_of_ext by num_blocks read In commit e11f5bd8228f ("drm: Add support for DP 1.4 Compliance edid corruption test") the function connector_bad_edid() started assuming that the memory for the EDID passed to it was big enough to hold `edid[0x7e] + 1` blocks of data (1 extra for the base block). It completely ignored the fact that the function was passed `num_blocks` which indicated how much memory had been allocated for the EDID. Let's fix this by adding a bounds check. This is important for handling the case where there's an error in the first block of the EDID. In that case we will call connector_bad_edid() without having re-allocated memory based on `edid[0x7e]`.

References
Link Resource
https://git.kernel.org/stable/c/09f3946bb452918dbfb1982add56f9ffaae393dc Patch
https://git.kernel.org/stable/c/97794170b696856483f74b47bfb6049780d2d3a0 Patch
https://git.kernel.org/stable/c/a7b45024f66f9ec769e8dbb1a51ae83cd05929c7 Patch
https://git.kernel.org/stable/c/09f3946bb452918dbfb1982add56f9ffaae393dc Patch
https://git.kernel.org/stable/c/97794170b696856483f74b47bfb6049780d2d3a0 Patch
https://git.kernel.org/stable/c/a7b45024f66f9ec769e8dbb1a51ae83cd05929c7 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:*:*:*:*:*:*
History

25 Sep 2025, 16:01

Type Values Removed Values Added
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 5.5
References () https://git.kernel.org/stable/c/09f3946bb452918dbfb1982add56f9ffaae393dc - () https://git.kernel.org/stable/c/09f3946bb452918dbfb1982add56f9ffaae393dc - Patch
References () https://git.kernel.org/stable/c/97794170b696856483f74b47bfb6049780d2d3a0 - () https://git.kernel.org/stable/c/97794170b696856483f74b47bfb6049780d2d3a0 - Patch
References () https://git.kernel.org/stable/c/a7b45024f66f9ec769e8dbb1a51ae83cd05929c7 - () https://git.kernel.org/stable/c/a7b45024f66f9ec769e8dbb1a51ae83cd05929c7 - Patch
CWE NVD-CWE-noinfo
First Time Linux
Linux linux Kernel
CPE cpe:2.3:o:linux:linux_kernel:5.15:rc5:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.15:rc4:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.15:rc3:*:*:*:*:*:*
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:*:*:*:*:*:*:*:*

21 Nov 2024, 06:36

Type Values Removed Values Added
References () https://git.kernel.org/stable/c/09f3946bb452918dbfb1982add56f9ffaae393dc - () https://git.kernel.org/stable/c/09f3946bb452918dbfb1982add56f9ffaae393dc -
References () https://git.kernel.org/stable/c/97794170b696856483f74b47bfb6049780d2d3a0 - () https://git.kernel.org/stable/c/97794170b696856483f74b47bfb6049780d2d3a0 -
References () https://git.kernel.org/stable/c/a7b45024f66f9ec769e8dbb1a51ae83cd05929c7 - () https://git.kernel.org/stable/c/a7b45024f66f9ec769e8dbb1a51ae83cd05929c7 -
Summary
  • (es) En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: drm/edid: En conector_bad_edid() cap num_of_ext por num_blocks leído En commit e11f5bd8228f ("drm: Agregar soporte para prueba de corrupción edid de cumplimiento de DP 1.4") la función conector_bad_edid() comenzó a asumir que la memoria para el EDID que se le pasó era lo suficientemente grande como para contener bloques de datos `edid[0x7e] + 1` (1 adicional para el bloque base). Ignoró por completo el hecho de que a la función se le pasó `num_blocks`, que indicaba cuánta memoria se había asignado para el EDID. Arreglemos esto agregando una verificación de los límites. Esto es importante para manejar el caso en el que hay un error en el primer bloque del EDID. En ese caso llamaremos a Connector_bad_edid() sin haber reasignado memoria en base a `edid[0x7e]`.

22 May 2024, 07:15

Type Values Removed Values Added
New CVE
Information

Published : 2024-05-22 07:15

Updated : 2025-09-25 16:01

NVD link : CVE-2021-47444

Mitre link : CVE-2021-47444

CVE.ORG link : CVE-2021-47444

JSON object : View

Products Affected

linux

CWE
NVD-CWE-noinfo