Zapscape, a new Linux kernel vulnerability, could allow an attacker with kernel privileges inside an L1 guest virtual machine (VM) to escape KVM isolation and execute code on the host. The risk applies when nested virtualization is exposed to untrusted guests.
The flaw is tracked as CVE-2026-64561 and affects KVM/x86’s shadow memory management unit (MMU), which manages shadow page Zapscape, a new Linux kernel vulnerability, could allow an attacker with kernel privileges inside an L1 guest virtual machine (VM) to escape KVM isolation and execute code on the host. The risk applies when nested virtualization is exposed to untrusted guests.
The flaw is tracked as CVE-2026-64561 and affects KVM/x86’s shadow memory management unit (MMU), which manages shadow page The Hacker News