CVE-2026-42492

UNKNOWN 0.0

vIRQ event channel binding may break Xenstore

CVSS Score

0.0

EPSS Score

0.0%

EPSS Percentile

0th

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.

Vendor	xen
Product	xen
Published	Jul 28, 2026
Last Updated	Jul 28, 2026

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Affected Versions

Xen / Xen

All versions affected

References

NVD ↗ CVE.org ↗ EPSS Data ↗

xenbits.xenproject.org: https://xenbits.xenproject.org/xsa/advisory-496.html xenbits.xen.org: http://xenbits.xen.org/xsa/advisory-496.html

Credits

This issue was discovered by Grygorii Strashko of EPAM.