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CVE-2026-23191

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: ALSA: aloop: Fix racy access at PCM trigger The PCM trigger callback of aloop driver tries to check the PCM state and stop the…

Published Feb 14, 2026CWE-416EPSS 0.14%

Overview

CVE-2026-23191 is a high-severity vulnerability. It was published on February 14, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. 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: aloop: Fix racy access at PCM trigger

The PCM trigger callback of aloop driver tries to check the PCM state

and stop the stream of the tied substream in the corresponding cable.

Since both check and stop operations are performed outside the cable

lock, this may result in UAF when a program attempts to trigger

frequently while opening/closing the tied stream, as spotted by

fuzzers.

For addressing the UAF, this patch changes two things:

- It covers the most of code in loopback_check_format() with

cable->lock spinlock, and add the proper NULL checks. This avoids

already some racy accesses.

- In addition, now we try to check the state of the capture PCM stream

that may be stopped in this function, which was the major pain point

leading to UAF.

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/5727ccf9d19ca414cb76d9b647883822e2789c2eRefgit.kernel.org/stable/c/826af7fa62e347464b1b4e0ba2fe19a92438084fRefgit.kernel.org/stable/c/bad15420050db1803767e58756114800cce91ea4

How CyberStrike helps

Frequently asked questions

What is CVE-2026-23191?

CVE-2026-23191 is a high-severity vulnerability. It was published on February 14, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2026-23191?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-23191?

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-2026-23191?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-23191 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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