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.
Analysis and contextual insights are available on OpenCVE Cloud.
Vendor Workaround
There is no known mitigation.
Tracking
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| Link | Providers |
|---|---|
| https://xenbits.xenproject.org/xsa/advisory-496.html |
|
Tue, 28 Jul 2026 19:15:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| First Time appeared |
Xen
Xen xen |
|
| Vendors & Products |
Xen
Xen xen |
Tue, 28 Jul 2026 16:15:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| 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. | |
| Title | vIRQ event channel binding may break Xenstore | |
| Weaknesses | CWE-459 | |
| References |
| |
| Metrics |
cvssV3_1
|
Status: PUBLISHED
Assigner: XEN
Published:
Updated: 2026-07-28T16:33:22.683Z
Reserved: 2026-04-27T14:20:24.139Z
Link: CVE-2026-42492
Updated: 2026-07-28T16:33:22.683Z
No data.
No data.
OpenCVE Enrichment
Updated: 2026-07-28T19:00:04Z
-
CWE-459
Incomplete Cleanup