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CVE-2026-64555

8.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: KVM: arm64: nv: Fix SPSR_EL2 restore in kvm_hyp_handle_mops() kvm_hyp_handle_mops() resets the single-step state machine as par…

Published Jul 27, 2026EPSS 0.13%

Overview

CVE-2026-64555 is a high-severity vulnerability. It was published on July 27, 2026 and has a CVSS 3.1 base score of 8.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.8, 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: nv: Fix SPSR_EL2 restore in kvm_hyp_handle_mops()

kvm_hyp_handle_mops() resets the single-step state machine as part of

rewinding state for a MOPS exception by modifying vcpu_cpsr() and

writing the result directly into hardware.

In the case of nested virtualization, vcpu_cpsr() is a synthetic value

such that the rest of KVM can deal with vEL2 cleanly. That means the

value requires translation before being written into hardware, which is

unfortunately missing from the MOPS handler.

Fix it by directly modifying SPSR_EL2 and avoiding the synthetic state

altogether, which will be resynchronized on the next 'full' exit back

to KVM.

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/10a568010e827108d149779908850afaec898846Refgit.kernel.org/stable/c/884b44256041ec6b2dcbe8e6a67384d26145cba1Refgit.kernel.org/stable/c/dd3b237eb7780d65eae296d3d3a70012b6e7a02fRefgit.kernel.org/stable/c/ff1022c3de46753eb7eba2f6efd990569e66ff95

How CyberStrike helps

Frequently asked questions

What is CVE-2026-64555?

CVE-2026-64555 is a high-severity vulnerability. It was published on July 27, 2026 and has a CVSS 3.1 base score of 8.8 (HIGH).

How severe is CVE-2026-64555?

This vulnerability has a CVSS 3.1 base score of 8.8, 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-2026-64555?

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-2026-64555?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-64555 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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