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CVE-2026-64157

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: netfs: Fix partial invalidation of streaming-write folio In netfs_invalidate_folio(), if the region of a partial invalidation o…

Published Jul 19, 2026EPSS 0.16%

Overview

CVE-2026-64157 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: Fix partial invalidation of streaming-write folio

In netfs_invalidate_folio(), if the region of a partial invalidation

overlaps the front (but not all) of a dirty write cached in a streaming

write page (dirty, but not uptodate, with the dirty region tracked by a

netfs_folio struct), the function modifies the dirty region - but

incorrectly as it moves the region forward by setting the start to the

start, not the end, of the invalidation region.

Fix this by setting finfo->dirty_offset to the end of the invalidation

region (iend).

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/3d9601c029b934b5b6a10f99791467b10eb6b211Refgit.kernel.org/stable/c/6a3d27116be2c5fb9a03d5cf37c486ac517f3689Refgit.kernel.org/stable/c/6d91acc7fb85d33ea58fca9b964a32a453937f4bRefgit.kernel.org/stable/c/f6b2569ae29b666fd15ff2848684c445ba442a39

How CyberStrike helps

Frequently asked questions

What is CVE-2026-64157?

CVE-2026-64157 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-2026-64157?

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-2026-64157?

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-2026-64157?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-64157 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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