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CVE-2026-42492 is a Xen hypervisor vulnerability in the domain-state tracking logic used to keep Xenstore informed about domains appearing and disappearing. The issue was introduced with the XEN_DOMCTL_get_domain_state operation. Management of the bitmap backing that operation is tied to binding the VIRQ_DOM_EXC virtual IRQ, but an error path in that binding logic can tear down the bitmap even when it was never successfully set up. Because an unprivileged guest domain can trigger the faulty error path, the flaw can disrupt Xenstore’s ability to maintain an accurate system view and can destabilize host management functionality.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
7 sources tracked across advisories and community write-ups. News coverage will land here when it surfaces.
No news coverage yet. Advisories and community discussion only.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.