SB2026040157 - Out-of-bounds write in Linux kernel apparmor

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Main Vulnerability Database SB2026040157

SB2026040157 - Out-of-bounds write in Linux kernel apparmor

Published: April 1, 2026

Security Bulletin ID SB2026040157
Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Code execution

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 security vulnerability.


1) Out-of-bounds write (CVE-ID: CVE-2026-23407)

The vulnerability allows a local user to execute arbitrary code or cause a denial of service.

The vulnerability exists due to improper bounds checking in the AppArmor verify_dfa() function when parsing a malformed DFA policy. A local user can provide a specially crafted AppArmor policy with differential encoding that triggers out-of-bounds memory access to execute arbitrary code or crash the kernel.

Successful exploitation requires the ability to load a malicious AppArmor profile, which requires user privileges but no special administrative rights beyond those needed to manage AppArmor policies.


Remediation

Install update from vendor's website.

References