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CVE-2026-64258

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: fuse-uring: remove request-less entries from ent_w_req_queue to fix NULL deref If a copy into the userspace ring buffer fails,…

Published Jul 25, 2026CWE-476EPSS 0.16%

Overview

CVE-2026-64258 is a medium-severity vulnerability. It was published on July 25, 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:

fuse-uring: remove request-less entries from ent_w_req_queue to fix NULL deref

If a copy into the userspace ring buffer fails, a request will be

terminated and fuse_uring_req_end() will set ent->fuse_req to NULL but

it will leave the entry on ent_w_req_queue in FRRS_FUSE_REQ state. This

can lead to a NULL deref if the request expiration logic scans

ent_w_req_queue in the window before the entry is moved off it.

Fix this by taking the entry off ent_w_req_queue and changing its state

from FRRS_FUSE_REQ to FRRS_INVALID before terminating the request.

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/0a7f33010c0e4cd92937e088a54350381fd0fbf2Refgit.kernel.org/stable/c/0b466cf1b96e191b06b496c4de79da15315c3a9aRefgit.kernel.org/stable/c/1c57a69be962d459c5e705f5cb4355b841b3461c

How CyberStrike helps

Frequently asked questions

What is CVE-2026-64258?

CVE-2026-64258 is a medium-severity vulnerability. It was published on July 25, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2026-64258?

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-2026-64258?

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-2026-64258?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-64258 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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