CVE-2026-42488: Xen

High severity, CVSS 8.1. EPSS: 0.4% chance of exploitation in the next 30 days.

Some shadow paging errors paths will switch the page-tables without updating the currently running vCPU reference. This causes a mismatch between the loaded page-tables and the mapcache metadata which can lead to corruption of the mapcache.

Affected products

• Xen Xen

Published 2026-06-18. Last modified 2026-06-22.