Hyper-V in Microsoft Windows Server 2008 Gold, SP2, and R2 allows guest OS users to cause a denial of service (host OS hang) by sending a crafted encapsulated packet over the VMBus, aka "Hyper-V VMBus Vulnerability."
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A12359
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2010/ms10-102
http://www.vupen.com/english/advisories/2010/3224
http://www.us-cert.gov/cas/techalerts/TA10-348A.html
http://www.securitytracker.com/id?1024884
http://www.securityfocus.com/bid/45293