Massive Zero-Day Vulnerability Discovered in KVM Allowing VM Escape to Host Root Access

A cybersecurity researcher has uncovered a critical zero-day vulnerability affecting KVM (Kernel-based Virtual Machine), a foundational Linux virtualization technology that powers much of the cloud. The flaw enables a guest virtual machine to escape to the host and gain root-level access, with potential for cross-tenant compromise in cloud environments. Vercel has confirmed the vulnerability, though specific exploit details, affected versions, or a CVE identifier have not yet been publicly reported.