Vulnerability in Linux Kernel Affecting OCFS2 File System from Oracle

CVE-2025-40233

What is CVE-2025-40233?

In a recent Linux kernel vulnerability, the OCFS2 file system experiences issues due to a stale extent map cache when extents are moved or defragmented. Specifically, operations such as reflinking and trimming have led to a situation where the memory cached extent flags do not reflect the updated state on disk. Consequently, write operations referencing outdated cached flags can cause operational failures, triggering critical error conditions. The resolution involves ensuring that the extent map cache is appropriately cleared after each move or defrag operation, guaranteeing that subsequent file operations access the most current extent data from disk.

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