CVE-2021-47502: ASoC: codecs: wcd934x: handle channel mappping list correctly

Severity: medium (CVSS 5.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-05-24 · updated 2026-08-04

Description

In the Linux kernel, the following vulnerability has been resolved: ASoC: codecs: wcd934x: handle channel mappping list correctly Currently each channel is added as list to dai channel list, however there is danger of adding same channel to multiple dai channel list which endups corrupting the other list where its already added. This patch ensures that the channel is actually free before adding to the dai channel list and also ensures that the channel is on the list before deleting it. This check was missing previously, and we did not hit this issue as we were testing very simple usecases with sequence of amixer commands.

Affected products

Linux kernel: from 5.6 before 5.10.85; from 5.11 before 5.15.8; 5.16-rc1, 5.16-rc2, 5.16-rc3, 5.16-rc4 — fixed in 5.10.85, 5.15.8

How to fix

Upgrade to a fixed version: Linux kernel 5.10.85, 5.15.8. Check the vendor advisory for mitigations.

References

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