:) I'm quite familiar with virtualization. My understanding of the Ethereum implementation and requisite cryptography give me a sense of security. Well, there is a 6 billion bounty right now so let us wait and see.
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Indeed it's 6 billion, I was used to 1 billion though, I was invested in other markets though.
My fear is from all these privilege escalations that you find on linux systems. On Windows, I don't even have words for that, but on Linux it's pretty frustrating as well.
You can basically introduce some memory loophole or low level bug, that will take over a full node for example, and if a coordinated attack like that happens on multiple nodes, that could be a real issue.
We already know that most hardwares are insecure, and given the complexity of ETH, this only increases the probability of such hacks occuring.
Either we invent some dedicated ASIC for full nodes just as for mining, and similarly for private key holding, because we can't really trust established PC manufacturers (Intel, AMD, you name it). Or this will only get worse.