I've read up on forums, mailing lists and on The Register that there seems to be a severe hardware bug with Intel CPUs:
'Kernel memory leaking' Intel processor design flaw forces Linux, Windows redesign • The Register
There are Linux patches in the works, and Microsoft will release patches during January's patch tuesday. Is ESXi vurnerable, and if so, when can we expect a patch for this? Since it's a critical issue, it will require lots of patching and planning - any heads up would be appreciated!