CVE-2026-63796

A flaw was found in the Linux kernel's Oracle Cluster File System 2 (ocfs2). A local attacker could craft a malicious group bitmap descriptor that claims a size exceeding the physically allocated bitmap bytes. This improper input validation allows subsequent operations to read or write beyond the intended memory region, leading to a use-after-free vulnerability. This can result in a system crash (denial of service) or potentially lead to arbitrary code execution.