Race condition in Linux kernel - CVE-2026-63813
Published: July 21, 2026
Vulnerability identifier: #VU138837
CSH Severity: Low
CVSS v4: 5.7 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-63813
CWE-ID: CWE-362
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to a race condition in the f2fs garbage collection path in move_data_block() when handling folios during garbage collection on f2fs filesystems. A local user can trigger filesystem operations that exercise this race to cause a denial of service.
The issue can lead to list corruption and a kernel panic, and reports indicate it is more likely to occur when the f2fs partition is almost full.
Affected software
Linux kernel
How to mitigate CVE-2026-63813
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3