CVE-2026-53368

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

f2fs: fix fsck inconsistency caused by incorrect nat_entry flag usage

f2fs_need_dentry_mark() reads nat_entry flags without mutual exclusion

with the checkpoint path, which can result in an incorrect inode block

marking state. The scenario is as follows:

create & write & fsync 'file A' write checkpoint

- f2fs_do_sync_file // inline inode

- f2fs_write_inode // inode folio is dirty

- f2fs_write_checkpoint

- f2fs_flush_merged_writes

- f2fs_sync_node_pages

- f2fs_fsync_node_pages // no dirty node

- f2fs_need_inode_block_update // return true

- f2fs_fsync_node_pages // inode dirtied

- f2fs_need_dentry_mark //return true

- f2fs_flush_nat_entries

- f2fs_write_che

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References