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CVE-2026-64288

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: KVM: arm64: nv: Avoid dereferencing NULL VNCR pseudo-TLB VNCR TLB invalidation occurs from MMU notifiers or TLBI instructions,…

Published Jul 25, 2026CWE-476EPSS 0.16%

Overview

CVE-2026-64288 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: arm64: nv: Avoid dereferencing NULL VNCR pseudo-TLB

VNCR TLB invalidation occurs from MMU notifiers or TLBI instructions,

and either can race against a vcpu not being onlined yet (no pseudo-TLB

allocated). Similarly, the TLB might be invalid, and the invalidation

should be skipped in this case.

Both kvm_invalidate_vncr_ipa() and kvm_invalidate_vncr_va() are

expected to perform the same checks, except that the latter doesn't

check for the allocation and blindly dereferences the pointer.

Solve this by introducing a new iterator built on top of the usual

kvm_for_each_vcpu() that checks for both of the above conditions,

and convert the two users to it.

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/4be6cbeb93d26994bd1827ddbce391e3c4395c8fRefgit.kernel.org/stable/c/5fd30133af864a1de0a0bd87d3fe3cf23205fbc7Refgit.kernel.org/stable/c/7c73a269a880b1399baacfb9d521415e6ef7ecc2

How CyberStrike helps

Frequently asked questions

What is CVE-2026-64288?

CVE-2026-64288 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-2026-64288?

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-2026-64288?

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-2026-64288?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-64288 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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