Xen Hypervisor Flaws Let One Malicious VM Read and Write Any Other VM's Memory

Two critical vulnerabilities in the Xen hypervisor allow a malicious guest virtual machine to read and write the memory of other VMs running on the same host, including dom0. Dom0 is the privileged VM that manages all other VMs on the host, making this a severe privilege escalation and isolation bypass issue. The Xen Project published an advisory on November 3 confirming the flaws. All Xen versions from 4.6 onward are affected by these vulnerabilities. Patches have been released, but no known mitigations exist aside from applying the patches. The ability to cross VM memory boundaries represents a critical hypervisor escape scenario with significant implications for multi-tenant cloud and virtualization environments.