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CVE-2026-23269

7.1 · HIGH

In the Linux kernel, the following vulnerability has been resolved: apparmor: validate DFA start states are in bounds in unpack_pdb Start states are read from untrusted data and used as indexes i…

Published Mar 18, 2026CWE-125EPSS 0.14%

Overview

CVE-2026-23269 is a high-severity vulnerability. It was published on March 18, 2026 and has a CVSS 3.1 base score of 7.1 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.1, 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: validate DFA start states are in bounds in unpack_pdb

Start states are read from untrusted data and used as indexes into the

DFA state tables. The aa_dfa_next() function call in unpack_pdb() will

access dfa->tables[YYTD_ID_BASE][start], and if the start state exceeds

the number of states in the DFA, this results in an out-of-bound read.

==================================================================

BUG: KASAN: slab-out-of-bounds in aa_dfa_next+0x2a1/0x360

Read of size 4 at addr ffff88811956fb90 by task su/1097

...

Reject policies with out-of-bounds start states during unpacking

to prevent the issue.

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/07cf6320f40ea2ccfad63728cff34ecb309d03daRefgit.kernel.org/stable/c/0baadb0eece2c4d939db10d3c323b4652ac79a58Refgit.kernel.org/stable/c/15c3eb8916e7db01cb246d04a1fe6f0fdc065b0cRefgit.kernel.org/stable/c/3bb7db43e32190c973d4019037cedb7895920184Refgit.kernel.org/stable/c/5443c027ec16afa55b1b8a3e7a1ab2ea3c77767aRefgit.kernel.org/stable/c/5487871b2b56c19d26936ed6fdc62652b30941dfRefgit.kernel.org/stable/c/9063d7e2615f4a7ab321de6b520e23d370e58816Refgit.kernel.org/stable/c/f43eea8ae0102ea198da211ef7f5ce83725ecf19Refwww.qualys.com/2026/03/10/crack-armor.txt

How CyberStrike helps

Frequently asked questions

What is CVE-2026-23269?

CVE-2026-23269 is a high-severity vulnerability. It was published on March 18, 2026 and has a CVSS 3.1 base score of 7.1 (HIGH).

How severe is CVE-2026-23269?

This vulnerability has a CVSS 3.1 base score of 7.1, 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-2026-23269?

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-2026-23269?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-23269 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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