CVE-2026-42492
vIRQ event channel binding may break Xenstore
- State
- Published
- Severity
- 7.5 High
- Published
- Jul 28, 2026
- Updated
- Jul 28, 2026
- Reserved
- Apr 27, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 7.5 High | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | CISA-ADP |
Weaknesses
- CWE-459 Incomplete Cleanup
Affected Products
| Product | Versions |
|---|---|
XenXen |
|
References
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