source: http://www.securityfocus.com/bid/60794/info

Oracle VM VirtualBox is prone to a local denial-of-service vulnerability.

Attackers can exploit this issue to cause the host system's network to become unusable, resulting in denial-of-service condition.

VirtualBox 4.2.12 is affected; other versions may also be vulnerable. 

tracepath 8.8.8.8