cve 2026-23269

CVE-2026-23269 is a Linux kernel vulnerability in AppArmor's policy unpacking code, specifically in the unpack_pdb function. The issue involves insufficient validation of DFA start-state bounds, which could lead to memory-safety or parser-integrity problems. While the Microsoft Security Response Center page for this CVE is currently unavailable, the underlying fix is an upstream kernel hardening change. This type of bug is significant for enterprise environments running large fleets of Linux systems with AppArmor enabled. The tag covers discussions about the technical details of the vulnerability, its kernel patch context, and the implications for security posture.