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CVE-2026-42492

7.5 · HIGH

Xenstore, to have an up-to-date picture of the entire system, wants to know of domains appearing and disappearing.

Published Jul 28, 2026CWE-459EPSS 0.61%

Overview

CVE-2026-42492 is a high-severity vulnerability. It was published on July 28, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

Xenstore, to have an up-to-date picture of the entire system, wants to

know of domains appearing and disappearing. To make this more robust, a

new XEN_DOMCTL_get_domain_state was introduced. The management of the

bitmap underlying that operation is tied into the binding of the

VIRQ_DOM_EXC virtual IRQ. Unfortunately an error path there would tear

down the bitmap even in cases when it wasn't set up. Unprivileged domains

can trigger that error path.

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-496.htmlRefwww.openwall.com/lists/oss-security/2026/07/28/13Refxenbits.xen.org/xsa/advisory-496.html

How CyberStrike helps

Frequently asked questions

What is CVE-2026-42492?

CVE-2026-42492 is a high-severity vulnerability. It was published on July 28, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2026-42492?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-42492?

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-2026-42492?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-42492 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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