Linux Kernel Vulnerability in f2fs Affecting Inode Block Marking State

CVE-2026-53368

What is CVE-2026-53368?

The f2fs filesystem within the Linux kernel contains a vulnerability related to incorrect handling of nat_entry flags, leading to potential inconsistencies in inode block marking states. When a file is created, written, and synchronized, an improper sequence of operations may occur where the state observed by the system can produce discrepancies due to a lack of mutual exclusion during checkpoint processes. This can result in outdated inode indicators being flagged incorrectly, potentially affecting filesystem integrity and recovery operations. The fix involves realigning the handling of dentry marks within the inode writing process to ensure proper locking mechanisms are in place, securing the consistency of inode states during interactions with the checkpoint handling.

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