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CVE-2026-64286

8.2 · HIGH

In the Linux kernel, the following vulnerability has been resolved: KVM: arm64: Clear __hyp_running_vcpu when flushing the pKVM hyp vCPU flush_hyp_vcpu() copies the host vCPU context into the hyp…

Published Jul 25, 2026EPSS 0.18%

Overview

CVE-2026-64286 is a high-severity vulnerability. It was published on July 25, 2026 and has a CVSS 3.1 base score of 8.2 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.2, rated HIGH. 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: Clear __hyp_running_vcpu when flushing the pKVM hyp vCPU

flush_hyp_vcpu() copies the host vCPU context into the hyp's private

vCPU on every run. ctxt_to_vcpu() expects a guest context to have a

NULL __hyp_running_vcpu, which is only ever set on the host context, so

that it resolves the vCPU via container_of(). While this is generally

the case, flush_hyp_vcpu() copies the context verbatim and does not

enforce this, so a value provided by the host is dereferenced at EL2

(host -> EL2).

Fix by clearing __hyp_running_vcpu after the copy.

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/477145860dba4c30f0b4e36f02f4c5291c1c888bRefgit.kernel.org/stable/c/6bea2f8becdb20d34378493c3b77a9b9cf8c6cfaRefgit.kernel.org/stable/c/d4f4d61715d1061ba83b88196a3605662be30750Refgit.kernel.org/stable/c/dfaef40d8a1533940fc1af788d70fce07362b4ceRefgit.kernel.org/stable/c/e8042f6e1d7befb2fb6b10a75918642bcd0acf9a

How CyberStrike helps

Frequently asked questions

What is CVE-2026-64286?

CVE-2026-64286 is a high-severity vulnerability. It was published on July 25, 2026 and has a CVSS 3.1 base score of 8.2 (HIGH).

How severe is CVE-2026-64286?

This vulnerability has a CVSS 3.1 base score of 8.2, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-64286?

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-2026-64286?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-64286 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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