CVE-2021-47502: linux kernel — Fix

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.

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CVSS v3.1 Score

5.5

MEDIUM

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected Products

Vendor	Product	Versions
linux	linux_kernel	5.6 — 5.10.85
linux	linux_kernel	5.11 — 5.15.8
linux	linux_kernel	All
linux	linux_kernel	All
linux	linux_kernel	All
linux	linux_kernel	All

References

Advisories & Patches

https://git.kernel.org/stable/c/1089dac26c6b4b833323ae6c0ceab29fb30ede72 https://git.kernel.org/stable/c/23ba28616d3063bd4c4953598ed5e439ca891101 https://git.kernel.org/stable/c/339ffb5b56005582aacc860524d2d208604049d1 https://git.kernel.org/stable/c/1089dac26c6b4b833323ae6c0ceab29fb30ede72 https://git.kernel.org/stable/c/23ba28616d3063bd4c4953598ed5e439ca891101 https://git.kernel.org/stable/c/339ffb5b56005582aacc860524d2d208604049d1

Frequently Asked Questions

What is CVE-2021-47502? +

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. It has a CVSS v3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2021-47502? +

CVE-2021-47502 has a CVSS v3.1 score of 5.5 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2021-47502? +

CVE-2021-47502 affects products from linux, specifically: linux_kernel. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2021-47502? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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CVE-2021-47502