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CVE-2026-64266

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: fuse: re-lock request before returning from fuse_ref_folio() fuse_ref_folio() unlocks the request but does not re-lock it befor…

Published Jul 25, 2026CWE-416EPSS 0.16%

Overview

CVE-2026-64266 is a high-severity vulnerability. It was published on July 25, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. 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:

fuse: re-lock request before returning from fuse_ref_folio()

fuse_ref_folio() unlocks the request but does not re-lock it before

returning. fuse_chan_abort() can end the request and the async end

callback (eg fuse_writepage_free()) can free the args while the

subsequent copy chain logic after fuse_ref_folio() accesses them,

leading to use-after-free issues.

Fix this by locking the request in fuse_ref_folio() before returning.

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/0e4a5a000123d81234e27a2f8187688cf608f755Refgit.kernel.org/stable/c/1ca605cfa59377f0143fb35b5b01360f37d1b7c4Refgit.kernel.org/stable/c/1f9156714592356b4fda57beac7eab9c2a462dd3Refgit.kernel.org/stable/c/5630da218a45ba80f0aba0846cbe8aa655da122bRefgit.kernel.org/stable/c/65a1c2551f7e16085acbb54aedde1feaa559ba7aRefgit.kernel.org/stable/c/b5befa80fdbe287a98480effed9564712924add5Refgit.kernel.org/stable/c/be353caffa8640f5e25fb3714ce8b0cef5e410e5Refgit.kernel.org/stable/c/e6aa539720c3d8def69683ed0c07cf9faea4e8be

How CyberStrike helps

Frequently asked questions

What is CVE-2026-64266?

CVE-2026-64266 is a high-severity vulnerability. It was published on July 25, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2026-64266?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-64266?

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-2026-64266?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-64266 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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