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CVE-2026-64172

7.1 · HIGH

In the Linux kernel, the following vulnerability has been resolved: KVM: SVM: Disable AVIC IPI virtualization on Hygon Family 18h (erratum #1235) Hygon Family 18h CPUs are derived from AMD Family…

Published Jul 19, 2026EPSS 0.19%

Overview

CVE-2026-64172 is a high-severity vulnerability. It was published on July 19, 2026 and has a CVSS 3.1 base score of 7.1 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.1, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

KVM: SVM: Disable AVIC IPI virtualization on Hygon Family 18h (erratum #1235)

Hygon Family 18h CPUs are derived from AMD Family 17h (Zen1) silicon and

share the same erratum #1235: hardware may read a stale IsRunning=1 bit

during ICR write emulation and silently fail to generate an

AVIC_IPI_FAILURE_TARGET_NOT_RUNNING VM-Exit on the sending vCPU.

The absence of the VM-Exit causes KVM to miss the required wakeup of

blocking target vCPUs, leading to hung vCPUs and unbounded delays in

guest execution.

Extend the existing AMD Family 17h erratum #1235 workaround to also cover

Hygon Family 18h. With IPI virtualization disabled, KVM never sets

IsRunning=1 in the Physical ID table, so every non-self IPI generates a

VM-Exit and is correctly emulated.

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/94ade38f317ea086a181db0e6b69c574b3b70a5eRefgit.kernel.org/stable/c/9560e6fee887a9594a89fa265b5b9c79b1591803Refgit.kernel.org/stable/c/9a12fa5213cfc391e0eed63902d3be98f0913765

How CyberStrike helps

Frequently asked questions

What is CVE-2026-64172?

CVE-2026-64172 is a high-severity vulnerability. It was published on July 19, 2026 and has a CVSS 3.1 base score of 7.1 (HIGH).

How severe is CVE-2026-64172?

This vulnerability has a CVSS 3.1 base score of 7.1, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-64172?

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-2026-64172?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-64172 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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