cve 2026 43321

CVE-2026-43321 is a high-severity Linux kernel vulnerability in the BPF verifier, disclosed through kernel.org and Microsoft's Security Update Guide with a CVSS 3.1 score of 7.8. The bug involves a register used by an indirect BPF jump not being marked live during verifier analysis, enabling local, low-complexity exploitation. This tag covers discussions on the technical details, implications for kernel security, and the intersection of compiler theory and operating-system attack surfaces. Content includes analysis of the vulnerability's disclosure, exploitation characteristics, and relevance to enterprise IT environments using Linux or Windows Subsystem for Linux.