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CVE-2026-64285

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: KVM: SEV: Pin source page for write when adding CPUID data for SNP guest When populating a guest_memfd instance with the initia…

Published Jul 25, 2026EPSS 0.14%

Overview

CVE-2026-64285 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:

KVM: SEV: Pin source page for write when adding CPUID data for SNP guest

When populating a guest_memfd instance with the initial CPUID data for an

SNP guest, acquire a writable pin on the source page as KVM will write back

the "correct" CPUID information if the userspace provided data is rejected

by trusted firmware. Because KVM writes to the source page using a kernel

mapping, pinning for read could result in KVM clobbering read-only memory.

Note, well-behaved VMMs are unlikely to be affected, as CPUID information

is almost always dynamically generated by userspace, i.e. it's unlikely for

the CPUID information to be backed by a read-only mapping.

[sean: rewrite shortlog and changelog, tag for stable@]

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/dcdb476f5fc5701ec06c23efe3e3529f07ca391eRefgit.kernel.org/stable/c/f13e900599089b10113ceb36013423f0837c6792

How CyberStrike helps

Frequently asked questions

What is CVE-2026-64285?

CVE-2026-64285 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-2026-64285?

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-2026-64285?

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-2026-64285?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-64285 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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