SB20260917126 - Race condition in Linux kernel f2fs

Description

This security bulletin contains information about 1 vulnerability.

1) Race condition (CVE-ID: CVE-2026-89836)

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

CVSSv4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a local user to cause a denial of service and corrupt page state.

The vulnerability exists due to a race condition in f2fs_get_read_data_folio() when invalidating a large folio from the page cache. A local user can trigger concurrent truncation or folio splitting to cause a denial of service and corrupt page state.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/0dab71381f1b4d12dc2056f8bd5aaa9d93ce9082
• https://git.kernel.org/stable/c/cc34df18da92f68f9b384c3ae95ad64be46cb5ee