Bug 2414481 (CVE-2025-40121)

Summary: CVE-2025-40121 kernel: ASoC: Intel: bytcr_rt5651: Fix invalid quirk input mapping
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Priority: medium    
Version: unspecifiedKeywords: Security
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OS: Linux   
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A flaw was found in the Linux kernel’s ASoC (Audio) subsystem: in the Intel bytcr_rt5651/rt5640 driver, when a “quirk” option is supplied from user-space, invalid values are not properly validated, and the driver retains them. This can lead to unexpected behavior, including out-of-bounds accesses
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Description OSIDB Bzimport 2025-11-12 11:02:37 UTC 
In the Linux kernel, the following vulnerability has been resolved:

ASoC: Intel: bytcr_rt5651: Fix invalid quirk input mapping

When an invalid value is passed via quirk option, currently
bytcr_rt5640 driver just ignores and leaves as is, which may lead to
unepxected results like OOB access.

This patch adds the sanity check and corrects the input mapping to the
certain default value if an invalid value is passed.
Comment 1 Alexander B 2025-11-13 15:53:32 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025111252-CVE-2025-40121-c2ef@gregkh/T