# CVE-2025-40154: ASoC: Intel: bytcr_rt5640: Fix invalid quirk input mapping

> A local attacker with high privileges can trigger out-of-bounds memory access in the Intel bytcr_rt5640 audio driver by passing invalid quirk options, potentially leading to code execution or system crash.

- **Severity:** Not scored
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 12 Nov 2025
- **Updated:** 16 Jun 2026
- **Also known as:** BELL-CVE-2025-40154, DEBIAN-CVE-2025-40154, GHSA-8q99-hhgh-7gww, ROOT-OS-DEBIAN-11-CVE-2025-40154, ROOT-OS-DEBIAN-13-CVE-2025-40154, ROOT-OS-UBUNTU-2404-CVE-2025-40154, UBUNTU-CVE-2025-40154

## What is CVE-2025-40154?

CVE-2025-40154 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_rt5640: Fix invalid quirk input mapping

When an invalid value is passed via quirk option, currently
bytcr_rt5640 driver only shows an error message but leaves as is.
This may lead to unepxected results like OOB access.

This patch corrects the input mapping to the certain default value if
an invalid value is passed.

## Which versions are affected by CVE-2025-40154?


## How do I fix CVE-2025-40154?

Apply the vendor's patch.

## Is CVE-2025-40154 being exploited?

There is no known exploitation of CVE-2025-40154 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-40154 and fix it if it is affected.

What it is: CVE-2025-40154 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.
Exploitation: There is no known exploitation of CVE-2025-40154 in the wild and no public exploit code.

Affected product: Linux. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2025-40154/ (Markdown: https://insights.sbomify.com/CVE-2025-40154/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-40154
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-40154
- OSV: https://osv.dev/vulnerability/CVE-2025-40154

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-40154/
Summaries are generated and may contain mistakes; the official description above is the record.