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CVE-2026-23405

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: apparmor: fix: limit the number of levels of policy namespaces Currently the number of policy namespaces is not bounded relying…

Published Apr 1, 2026EPSS 0.18%

Overview

CVE-2026-23405 is a medium-severity vulnerability. It was published on April 1, 2026 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:

apparmor: fix: limit the number of levels of policy namespaces

Currently the number of policy namespaces is not bounded relying on

the user namespace limit. However policy namespaces aren't strictly

tied to user namespaces and it is possible to create them and nest

them arbitrarily deep which can be used to exhaust system resource.

Hard cap policy namespaces to the same depth as user namespaces.

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/306039414932c80f8420695a24d4fe10c84ccfb2Refgit.kernel.org/stable/c/3f8699b3ee0c04b4b9bc27b82cd89a40e81e1d2eRefgit.kernel.org/stable/c/6b396cc2f0365e684fc1d3547d18ef79fcee225dRefgit.kernel.org/stable/c/7b6495ead2c611647f6b11441a852324e3eb8616Refgit.kernel.org/stable/c/853ce31ca72097d23991a06876a2ccb5cb64b603Refgit.kernel.org/stable/c/87d0cecc900e55d55fc4dbfb43ac93e269c7a5b3Refgit.kernel.org/stable/c/b1226e37eb3754d389721c135db6107db94c7a72Refgit.kernel.org/stable/c/d42b2b6bb77ca40ee34ab74ad79305840b5f315d

How CyberStrike helps

Frequently asked questions

What is CVE-2026-23405?

CVE-2026-23405 is a medium-severity vulnerability. It was published on April 1, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2026-23405?

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-2026-23405?

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-2026-23405?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-23405 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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