Undocumented x86 instructions in Intel CPUs that can modify microcode
There was an interesting black hat talk about automatically finding undocumented instructions. [0]Interesting comment on twitter to the instruction of the original post[1][0] https://www.youtube.com/watch?v=KrksBdWcZgQ&t=3[1] https://twitter.com/eigma/status/1373155650432290819