cve 2026 23408

CVE-2026-23408 is a vulnerability in the Linux kernel's AppArmor module that can lead to a denial of service through a double-free condition during profile replacement. Microsoft has rated it as an availability risk, meaning an attacker could exploit it to cause a total loss of service in the affected component. The issue arises from a memory-management flaw in AppArmor's policy loading or replacement process, potentially destabilizing this critical security enforcement layer. The Linux kernel fix is narrowly targeted, but the operational implications are significant for systems relying on AppArmor. This tag covers discussions about the vulnerability's impact, severity, and the associated patch, with relevance to Linux security and enterprise IT environments.