Directory Memory Leak in Linux Kernel Affects Multiple Versions

CVE-2025-40105

What is CVE-2025-40105?

A vulnerability in the Linux kernel allows for a memory leak when user calls to open_by_handle_at() create disconnected directory dentries. This inconsistency may arise due to filesystem corruption or race conditions during renaming. Consequently, new dentries may not be marked as disconnected, leading to potential memory leaks. This situation could trigger issues like the 'Busy inodes after unmount' problem, complicating memory management and filesystem operations. Proper handling of dentry states is crucial to maintain system integrity.

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