0.0
NA
CVE-2021-47650
Linux Kernel ASoC soc-compress Null Pointer Use
Description

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'.

INFO

Published Date :

Feb. 26, 2025, 6:37 a.m.

Last Modified :

Feb. 26, 2025, 6:37 a.m.

Remotely Exploit :

No

Source :

416baaa9-dc9f-4396-8d5f-8c081fb06d67
Affected Products

The following products are affected by CVE-2021-47650 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Linux linux_kernel
: Total Affected Vendor : 1 | Products : 1
Solution
Follow the instructions below to mitigate the CVE-2021-47650 vulnerability.
There is no known solution at this time.
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2021-47650.

URL Resource
https://git.kernel.org/stable/c/08af6da684b44097ea09f1d74d5858b837ed203b
https://git.kernel.org/stable/c/4639c1d97f385f4784f44d66a3da0672f4951ada
https://git.kernel.org/stable/c/68a69ad8df959e5211ed4a8e120783b2d352ea74
https://git.kernel.org/stable/c/de2c6f98817fa5decb9b7d3b3a8a3ab864c10588
https://git.kernel.org/stable/c/f69a75cb8a98c6c487d620442c68595726a69f60
https://git.kernel.org/stable/c/fc237b8d624f4bcb0f21a532627ce4e3b3a85569
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2021-47650 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2021-47650 weaknesses.

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2021-47650 vulnerability anywhere in the article.

Results are limited to the first 20 news articles due to potential performance issues.

The following table lists the changes that have been made to the CVE-2021-47650 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Feb. 26, 2025

    Action Type Old Value New Value
    Added Description 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'.
    Added Reference https://git.kernel.org/stable/c/08af6da684b44097ea09f1d74d5858b837ed203b
    Added Reference https://git.kernel.org/stable/c/4639c1d97f385f4784f44d66a3da0672f4951ada
    Added Reference https://git.kernel.org/stable/c/68a69ad8df959e5211ed4a8e120783b2d352ea74
    Added Reference https://git.kernel.org/stable/c/de2c6f98817fa5decb9b7d3b3a8a3ab864c10588
    Added Reference https://git.kernel.org/stable/c/f69a75cb8a98c6c487d620442c68595726a69f60
    Added Reference https://git.kernel.org/stable/c/fc237b8d624f4bcb0f21a532627ce4e3b3a85569
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
Vulnerability Scoring Details
No CVSS metrics available for this vulnerability.