shadow mmu

The shadow mmu tag covers reporting on a Linux KVM vulnerability in the shadow-MMU hugepage recovery path. The documented issue, CVE-2026-63807, can cause a KVM host crash when a guest’s page-table layout crosses the lower boundary of a KVM memory slot. It affects the Linux kernel running KVM rather than Windows or another guest operating system, and the available information does not confirm a virtual-machine escape. Coverage focuses on the operational response: install a vendor kernel package containing the fix, reboot the Linux KVM host, and verify that the remediated kernel is active. NVD CVSS scoring is not assigned in the supplied record.