The problem is Intel exclusive, it is a flaw in the design. There is an area of the CPU that allows direct access to the kernel. This means hackers can basically walk straight in.
I explained how you fix it. Well, no, I didn't, Gareth Halfacree did with the "You can't turn left" theory. IE - Intel need to patch the kernel so that it uses a different path than the one it does now, meaning it is much slower because it has to go the long way. IE - try and plan in your head getting to a destination without turning left..
They will only fix it if and when they completely change the technology. Obviously Jim Keller did not make this "mistake" nor did he do it possibly just to boost performance and make the competition look bad. That is one question we will never know the answer to, but yes, until Intel change their tech (and not just a shrink) the "error" or "flaw" will continue to exist.
It's a flaw with the entire architecture. Now imagine having to explain to a huge data centre that their productivity is about to nose dive by 30% pmsl. I shouldn't laugh, but yeah, cue Epyc....