CVE-2026-42492

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.

• CWE-459

• https://xenbits.xenproject.org/xsa/advisory-496.html
• https://www.openwall.com/lists/oss-security/2026/07/28/13
• https://xenbits.xen.org/xsa/advisory-496.html

Published

Jul 28, 2026

Last Modified

Jul 28, 2026

Status

Deferred

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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