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CVE-2025-23134

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: ALSA: timer: Don't take register_mutex with copy_from/to_user() The infamous mmap_lock taken in copy_from/to_user() can be ofte…

Published Apr 16, 2025CWE-667EPSS 0.15%

Overview

CVE-2025-23134 is a medium-severity vulnerability. It was published on April 16, 2025 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

ALSA: timer: Don't take register_mutex with copy_from/to_user()

The infamous mmap_lock taken in copy_from/to_user() can be often

problematic when it's called inside another mutex, as they might lead

to deadlocks.

In the case of ALSA timer code, the bad pattern is with

guard(mutex)(&register_mutex) that covers copy_from/to_user() -- which

was mistakenly introduced at converting to guard(), and it had been

carefully worked around in the past.

This patch fixes those pieces simply by moving copy_from/to_user() out

of the register mutex lock again.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/15291b561d8cc835a2eea76b394070cf8e072771Refgit.kernel.org/stable/c/296f7a9e15aab276db11206cbc1e2ae1215d7862Refgit.kernel.org/stable/c/3424c8f53bc63c87712a7fc22dc13d0cc85fb0d6Refgit.kernel.org/stable/c/b074f47e55df93832bbbca1b524c501e6fea1c0d

How CyberStrike helps

Frequently asked questions

What is CVE-2025-23134?

CVE-2025-23134 is a medium-severity vulnerability. It was published on April 16, 2025 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2025-23134?

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2025-23134?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2025-23134?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-23134 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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