Translation Leak-Aside Buffer: Defeating Cache Side-Channel Protections [pdf] (opens in new tab)

This is TLBleed - the reason OpenBSD disabled SMT (HyperThreading).

Overview from security researchers: https://www.vusec.net/projects/tlbleed/

Previous discussions:

https://news.ycombinator.com/item?id=17389377

https://news.ycombinator.com/item?id=17350278