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CVE-2026-64267

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: fuse: avoid 32-bit prune notification count wrap FUSE_NOTIFY_PRUNE validates the nodeid payload length with: size - sizeof…

Published Jul 25, 2026EPSS 0.16%

Overview

CVE-2026-64267 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: avoid 32-bit prune notification count wrap

FUSE_NOTIFY_PRUNE validates the nodeid payload length with:

size - sizeof(outarg) != outarg.count * sizeof(u64)

On 32-bit kernels, size_t is also 32 bits, so the daemon-controlled

count multiplication can wrap. A prune notification with count

0x20000000 and no nodeid payload passes the check, enters the copy

loop, and asks the device copy path to read nodeids that are not

present in the userspace write buffer. In QEMU this reaches the

fuse_copy_fill() BUG_ON(!err) path.

Validate the payload length with array_size() instead. That accepts

exactly the same valid messages, but avoids wrapping arithmetic before

the copy loop consumes the count.

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/54243797cedf55447b4c5d560e8cd709900061aeRefgit.kernel.org/stable/c/6e2d84fdeac05bfd858e84a76353fdb84f23a43eRefgit.kernel.org/stable/c/c78c4b242299bc581e4987e5c2786c6f4760c516

How CyberStrike helps

Frequently asked questions

What is CVE-2026-64267?

CVE-2026-64267 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-2026-64267?

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-2026-64267?

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-2026-64267?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-64267 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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