CVE-2026-42492 — vIRQ event channel binding may break Xenstore
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 w…
Published: 2026-07-28 · CVSS: 7.5 · CVSS 3.1
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7