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CVE-2026-23408

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: apparmor: Fix double free of ns_name in aa_replace_profiles() if ns_name is NULL after 1071 error = aa_unpack(udata, &l…

Published Apr 1, 2026CWE-415EPSS 0.18%

Overview

CVE-2026-23408 is a high-severity vulnerability. It was published on April 1, 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:

apparmor: Fix double free of ns_name in aa_replace_profiles()

if ns_name is NULL after

1071 error = aa_unpack(udata, &lh, &ns_name);

and if ent->ns_name contains an ns_name in

1089 } else if (ent->ns_name) {

then ns_name is assigned the ent->ns_name

1095 ns_name = ent->ns_name;

however ent->ns_name is freed at

1262 aa_load_ent_free(ent);

and then again when freeing ns_name at

1270 kfree(ns_name);

Fix this by NULLing out ent->ns_name after it is transferred to ns_name

")

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/18b5233e860c294a847ee07869d93c0b8673a54bRefgit.kernel.org/stable/c/35f4caec1352054b9a61cfdf2bf1898073637aa0Refgit.kernel.org/stable/c/55ef2af7490aaf72f8ffe11ec44c6bcb7eb2162aRefgit.kernel.org/stable/c/5df0c44e8f5f619d3beb871207aded7c78414502Refgit.kernel.org/stable/c/7998ab3010d2317643f91828f1853d954ef31387Refgit.kernel.org/stable/c/86feeccd6b93ed94bd6655f30de80f163f8d5a45Refgit.kernel.org/stable/c/c053ae381ce227577567d1ef10090ce7506d7a28Refgit.kernel.org/stable/c/c6347a2116ecccb8fd9ee4ebc75ae41d1d7ef689

How CyberStrike helps

Frequently asked questions

What is CVE-2026-23408?

CVE-2026-23408 is a high-severity vulnerability. It was published on April 1, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2026-23408?

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-2026-23408?

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-2026-23408?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-23408 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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