CVE-2021-47650

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2021-47650
In the Linux kernel, the following vulnerability has been resolved: ASoC: soc-compress: prevent the potentially use of null pointer There is one call trace that snd_soc_register_card() ->snd_soc_bind_card()->soc_init_pcm_runtime() ->snd_soc_dai_compress_new()->snd_soc_new_compress(). In the trace the 'codec_dai' transfers from card->dai_link, and we can see from the snd_soc_add_pcm_runtime() in snd_soc_bind_card() that, if value of card->dai_link->num_codecs is 0, then 'codec_dai' could be null pointer caused by index out of bound in 'asoc_rtd_to_codec(rtd, 0)'. And snd_soc_register_card() is called by various platforms. Therefore, it is better to add the check in the case of misusing. And because 'cpu_dai' has already checked in soc_init_pcm_runtime(), there is no need to check again. Adding the check as follow, then if 'codec_dai' is null, snd_soc_new_compress() will not pass through the check 'if (playback + capture != 1)', avoiding the leftover use of 'codec_dai'.

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/08af6da684b44097ea09f1d74d5858b837ed203b Patch
https://git.kernel.org/stable/c/4639c1d97f385f4784f44d66a3da0672f4951ada Patch
https://git.kernel.org/stable/c/68a69ad8df959e5211ed4a8e120783b2d352ea74 Patch
https://git.kernel.org/stable/c/de2c6f98817fa5decb9b7d3b3a8a3ab864c10588 Patch
https://git.kernel.org/stable/c/f69a75cb8a98c6c487d620442c68595726a69f60 Patch
https://git.kernel.org/stable/c/fc237b8d624f4bcb0f21a532627ce4e3b3a85569 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:*:*:*:*:*:*:*:*
History

23 Sep 2025, 18:47

Type Values Removed Values Added
First Time Linux linux Kernel
Linux
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 5.5
CWE CWE-476
CPE cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Summary
  • (es) En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ASoC: soc-compress: evita el posible uso de un puntero nulo Hay un seguimiento de llamada que snd_soc_register_card() ->snd_soc_bind_card()->soc_init_pcm_runtime() ->snd_soc_dai_compress_new()->snd_soc_new_compress(). En el seguimiento, 'codec_dai' se transfiere desde card->dai_link, y podemos ver desde snd_soc_add_pcm_runtime() en snd_soc_bind_card() que, si el valor de card->dai_link->num_codecs es 0, entonces 'codec_dai' podría ser un puntero nulo causado por un índice fuera de los límites en 'asoc_rtd_to_codec(rtd, 0)'. Además, varias plataformas llaman a snd_soc_register_card(), por lo que es mejor agregar la verificación en caso de uso incorrecto. Y como 'cpu_dai' ya se ha verificado en soc_init_pcm_runtime(), no es necesario volver a verificar. Si se agrega la verificación de la siguiente manera, si 'codec_dai' es nulo, snd_soc_new_compress() no pasará la verificación 'if (playback + capture != 1)', lo que evita el uso sobrante de 'codec_dai'.
References () https://git.kernel.org/stable/c/08af6da684b44097ea09f1d74d5858b837ed203b - () https://git.kernel.org/stable/c/08af6da684b44097ea09f1d74d5858b837ed203b - Patch
References () https://git.kernel.org/stable/c/4639c1d97f385f4784f44d66a3da0672f4951ada - () https://git.kernel.org/stable/c/4639c1d97f385f4784f44d66a3da0672f4951ada - Patch
References () https://git.kernel.org/stable/c/68a69ad8df959e5211ed4a8e120783b2d352ea74 - () https://git.kernel.org/stable/c/68a69ad8df959e5211ed4a8e120783b2d352ea74 - Patch
References () https://git.kernel.org/stable/c/de2c6f98817fa5decb9b7d3b3a8a3ab864c10588 - () https://git.kernel.org/stable/c/de2c6f98817fa5decb9b7d3b3a8a3ab864c10588 - Patch
References () https://git.kernel.org/stable/c/f69a75cb8a98c6c487d620442c68595726a69f60 - () https://git.kernel.org/stable/c/f69a75cb8a98c6c487d620442c68595726a69f60 - Patch
References () https://git.kernel.org/stable/c/fc237b8d624f4bcb0f21a532627ce4e3b3a85569 - () https://git.kernel.org/stable/c/fc237b8d624f4bcb0f21a532627ce4e3b3a85569 - Patch

26 Feb 2025, 06:37

Type Values Removed Values Added
New CVE
Information

Published : 2025-02-26 06:37

Updated : 2025-09-23 18:47

NVD link : CVE-2021-47650

Mitre link : CVE-2021-47650

CVE.ORG link : CVE-2021-47650

JSON object : View

Products Affected

linux

  • linux_kernel
CWE
CWE-476

NULL Pointer Dereference