CVE-2025-40121 ASoC: Intel: bytcr_rt5651: Fix invalid quirk input mapping
A local attacker with high privileges can trigger out-of-bounds memory access in the Intel bytcr_rt5651 audio driver by passing invalid quirk options, potentially leading to code execution or system crash.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-40121?
CVE-2025-40121 is a memory corruption vulnerability in Linux, published on 12 Nov 2025. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
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.
Which versions are affected by CVE-2025-40121?
How do I fix CVE-2025-40121?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2025-40121 being exploited?
There is no known exploitation of CVE-2025-40121 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2025-40121, DEBIAN-CVE-2025-40121, GHSA-7q66-w47h-g677, ROOT-OS-DEBIAN-11-CVE-2025-40121, ROOT-OS-DEBIAN-13-CVE-2025-40121, ROOT-OS-UBUNTU-2404-CVE-2025-40121 and 1 more.