Latest news that Linux had been potentially attack by some of the method it use to steal the SSH key to gain root access to the potential system.

According to US-CERT, the attack appears to rely on stolen SSH keys to gain access to a system. It then uses a local kernel exploit to gain root access, whereupon it installs the “phalanx2″ rootkit, derived from the older “phalanx” rootkit.

Since the ESX server is running on Linux kernel, I will strongly recommend we should keep an eye on the ESX host to ensure this is not impacted. That could become a serious impact to the virtualization.
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