CVE-2026-79609

Name of the Vulnerable Software and Affected Versions xen versions prior to 4.22.0 06-1.1

Description Xen Page Table Isolation (XPTI) is used to mitigate Meltdown by copying 64-bit PV guest page table entries from guest-chosen root page tables to the Xen-chosen one used by hardware. The directmap is utilized to read the guest root page table. However, PV guests may have a directmap that does not cover all memory, specifically when memory extends beyond the 5 TiB (or 3.5 TiB if CONFIG BIGMEM=y) address boundary.

Recommendations Update to version 4.22.0 06-1.1.