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CVE-2026-79611

5.5 · MEDIUM

For XSA-308 logic was introduced, as VMX VMEntry checks do not like the exact combination of state which occurs when #DB in intercepted, Single Stepping is active, and blocked by STI/MovSS is activ…

Published Oct 13, 2026CWE-843EPSS 0.16%

Overview

CVE-2026-79611 is a medium-severity vulnerability. It was published on October 13, 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

For XSA-308 logic was introduced, as VMX VMEntry checks do not like the

exact combination of state which occurs when #DB in intercepted, Single

Stepping is active, and blocked by STI/MovSS is active, despite this being

a legitimate state to be in. The resulting VMEntry failure is fatal to

the guest.

Sadly there is another special sub-case of the above, with branch tracing

enabled. In that case the prior adjustment would still cause a VMentry

failure, as before fatal to the guest.

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

Refxenbits.xenproject.org/xsa/advisory-518.htmlRefwww.openwall.com/lists/oss-security/2026/10/13/7Refxenbits.xen.org/xsa/advisory-518.html

How CyberStrike helps

Frequently asked questions

What is CVE-2026-79611?

CVE-2026-79611 is a medium-severity vulnerability. It was published on October 13, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2026-79611?

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-2026-79611?

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-2026-79611?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-79611 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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