Microsoft Windows Hyper-V VMBus Persistent DoS Vulnerability

A denial of service vulnerability exists in Hyper-V on Windows Server 2008 and Windows Server 2008 R2. The vulnerability is due to Hyper-V servers insufficiently validating specific sequences of machine instructions. An attacker who successfully exploited this vulnerability could cause the affected Hyper-V system to stop responding. This would affect all virtual machines hosted by that system.