A critical Linux kernel vulnerability dubbed Zapscape (CVE-2026-64561) has been discovered that enables attackers with kernel privileges in L1 guest VMs to break KVM isolation and execute code on host systems. The flaw resides in KVM/x86's shadow memory management unit (MMU) and poses significant risk in environments where nested virtualization is exposed to untrusted guests.
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
Originally published at thehackernews.com
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