VULNERABILITY INTELLIGENCE
CVE-2026-42492
CVSS score7.5 HIGH
EPSS probability0.61%
CISA KEVNot currently listed
Published2026-07-28
Last modified2026-07-28
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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.
Weakness classification
- 134c704f-9b21-4f2e-91b3-4a467353bcc0: CWE-459