CVE-2026-42492

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.

References

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

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

http://www.openwall.com/lists/oss-security/2026/07/28/13

Details

Source: Mitre, NVD

Risk Information

CVSS v2

CVSS v3