Race condition in Linux kernel - CVE-2026-53368
Published: July 21, 2026
Vulnerability identifier: #VU138899
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-53368
CWE-ID: CWE-362
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows a local user to cause file system inconsistency.
The vulnerability exists due to a race condition in f2fs nat_entry flag handling in fs/f2fs/node.c when syncing files and writing checkpoints concurrently. A local user can trigger file write, fsync, and checkpoint activity to cause file system inconsistency.
The issue can leave an inode marked with DENT_BIT_SHIFT after it has already been checkpointed, which may be detected by fsck.
How to mitigate CVE-2026-53368
Install security update from vendor's repository.