SB2026072113 - Race condition in Linux kernel f2fs

Description

This security bulletin contains information about 1 vulnerability.

1) Race condition (CVE-ID: CVE-2026-63813)

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

CVSSv4: 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]

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.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/1991d49433e90b2202de2fe90be3c24161873d7c
• https://git.kernel.org/stable/c/6e035dae44154af4dd7bdb8ef7a1118c0b5f17b6
• https://git.kernel.org/stable/c/ccaba785821970f422c47770331c7e3271763f17