SB20260720159 - Race condition in Linux kernel netfs subrequest list handling

Description

This security bulletin contains information about 1 vulnerability.

1) Race condition (CVE-ID: CVE-2026-64067)

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

CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/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 missing memory barriers in netfs subrequest list handling when processing netfs read and write subrequests locklessly. A local user can trigger concurrent read or write operations to cause a denial of service.

The issue affects access to stream->subrequests and subreq->flags in netfs_collect_read_results(), netfs_collect_write_results(), and related queueing logic.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/293a4532c36f38458e38b8879b174ab797718b9d
• https://git.kernel.org/stable/c/b5782e2d462c028096f922abca46318cec890670