cve 2025 40233

CVE-2025-40233 is a kernel vulnerability in the OCFS2 (Oracle Cluster File System version 2) for Linux. The bug involves a caching issue in the extent map cache that can become stale after extent moves or defragmentation operations. This stale cache can cause subsequent I/O to read outdated extent flags, potentially leading to a kernel BUG. The fix, applied in __ocfs2_move_extents_range, explicitly clears the extent map cache after each extent move or defragmentation. This tag covers discussions about the vulnerability, its impact on clustered filesystem stability, and the kernel patch that resolves it.