The Parallels VM escape bug reminds me of a bug I reported to VMware about two years ago. I was waiting until a patch was released before posting, but I ended up forgetting. Just an LPE bug on the host side, feel free to check it out if you're curious. (A colleague of mine forgot his MacBook password, so I discovered the bug in order to read the admin hash and crack it. He made a 'guest' account luckily before.) The diagram might look ugly, tho. PoC is available if you want, but it's a simple logic bug, so easy to exploit.