SB2026072175 - Race condition in Linux kernel f2fs

Description

This security bulletin contains information about 1 vulnerability.

1) Race condition (CVE-ID: CVE-2026-53368)

CWE-ID: CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

CVSSv4: 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

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.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/019f9dda7f66e55eb94cd32e1d3fff5835f73fbc
• https://git.kernel.org/stable/c/b28a83ea4934215b5de906c3ee4fbfbc651573e0
• https://git.kernel.org/stable/c/bedb710b63ae1bd617e65d0a8cf6cea1200b3753