A Linux kernel vulnerability, identified as CVE-2026-64561, could enable attackers to circumvent a KVM virtual machine and gain control over the underlying host system with root privileges This article explores vulnerability kvm shadow. . This flaw impacts KVM/x86, a virtualization technology that isolates guest systems from physical servers.
The issue is particularly concerning for cloud providers and enterprises using untrusted workloads. Security researcher Hyunwoo Kim, known as V4bel, discovered this vulnerability in KVM’s shadow memory management unit (shadow MMU). The vulnerability is due to a use-after-free bug in KVM's recursive zap path when reclaiming shadow pages. Such an exploit could lead to data theft, service disruptions, access to other virtual machines on the same server, or even control of the entire host system.
A GitHub proof-of-concept showcases the escape chain within a controlled QEMU TCG environment, leading to a root-owned file on the host. The affected code was introduced in 2020 and fixed upstream in Linux commit 2abd5287f083 on July 21, 2026. They should also restrict access to /dev/kvm, review host configurations, identify exposed multi-tenant systems, and monitor vendor advisories for updates.
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