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CVE-2026-64156

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: netfs, afs: Fix write skipping in dir/link writepages Fix netfs_write_single() and afs_single_writepages() to better handle a w…

Published Jul 19, 2026EPSS 0.16%

Overview

CVE-2026-64156 is a medium-severity vulnerability. It was published on July 19, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

netfs, afs: Fix write skipping in dir/link writepages

Fix netfs_write_single() and afs_single_writepages() to better handle a

write that would be skipped due to lock contention and WB_SYNC_NONE by

returning 1 from netfs_write_single() if it skipped and making

afs_single_writepages() skip also. If a skip occurs, the inode must be

re-marked as the VFS may have cleared the mark.

This is really only theoretical for directories in netfs_write_single() as

the only path to that is through afs_single_writepages() that takes the

->validate_lock around it, thereby serialising it.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/77bb293049d61e04c12b24ebbffafaf5ab36af90Refgit.kernel.org/stable/c/9871938f99cc6cb266a77265491660e2375271f5Refgit.kernel.org/stable/c/f91e10435c0dd37c48b1b25e6236284f656ddc0c

How CyberStrike helps

Frequently asked questions

What is CVE-2026-64156?

CVE-2026-64156 is a medium-severity vulnerability. It was published on July 19, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2026-64156?

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-64156?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-64156?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-64156 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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