SB20261007202 - Race condition in Linux kernel f2fs

Description

This security bulletin contains information about 1 vulnerability.

1) Race condition (CVE-ID: CVE-2026-93285)

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 thread lifetime management when processing sysfs updates concurrently with filesystem remount or shutdown operations. A local user can update sysfs attributes while the garbage-collection thread is being stopped to cause a denial of service.

Exploitation requires write access to the relevant f2fs sysfs attributes.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/23eee01c732ec8c62b05416a05f0f88129df2960
• https://git.kernel.org/stable/c/3d7bca9d583793bb7d0bac0d95a24ddd2e129eed
• https://git.kernel.org/stable/c/7ee6be9ee7f9a803e0f539af26ab1154fdde48ba
• https://git.kernel.org/stable/c/99d14d61aa8beb6cb9a984b9fcddd45e35b24494