Cybersecurity · 79 views
16-Year-Old Linux KVM Flaw Lets Guest VMs Escape to Host on Intel and AMD x86 Systems
Januscape abuses KVM shadow MMU page reuse to panic x86 hosts, with Kim reporting a controlled full escape exploit behind the unreleased path.
AI Summary
A use‑after‑free vulnerability in Linux’s KVM hypervisor, identified as CVE‑2026‑53359 and named “Januscape,” can be exploited from a guest virtual machine to corrupt the host kernel’s shadow‑page state. The flaw resides in the shadow MMU code shared by KVM on both Intel and AMD x86 platforms. This bug allows a guest VM to escape its isolation and affect the host system.
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