16-Year-Old Linux KVM Flaw Lets Guest VMs Escape to Host on Intel and AMD x86 Systems

A critical vulnerability has emerged in the Linux Kernel-based Virtual Machine (KVM) hypervisor that has remained undetected for an astonishing sixteen years. This flaw, now designated CVE-2026-53359 and nicknamed "Januscape," represents one of the most significant VM escape vulnerabilities discovered in recent years, potentially undermining the fundamental security premise