SB2026032089 - Out-of-bounds read in Linux kernel apparmor

Description

This security bulletin contains information about 1 vulnerability.

1) Out-of-bounds read (CVE-ID: CVE-2026-23269)

CWE-ID: CWE-125 - Out-of-bounds read

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear

The vulnerability allows a local user to disclose sensitive information.

The vulnerability exists due to an out-of-bounds read in the AppArmor subsystem's DFA state table validation when processing untrusted policy data. A local user can provide a specially crafted AppArmor policy with an out-of-bounds start state to trigger an out-of-bounds read during policy unpacking.

Exploitation requires the ability to load or modify AppArmor policies, which typically requires privileged access. The out-of-bounds read may expose contents of kernel memory.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/0baadb0eece2c4d939db10d3c323b4652ac79a58
• https://git.kernel.org/stable/c/15c3eb8916e7db01cb246d04a1fe6f0fdc065b0c
• https://git.kernel.org/stable/c/3bb7db43e32190c973d4019037cedb7895920184
• https://git.kernel.org/stable/c/9063d7e2615f4a7ab321de6b520e23d370e58816