They should have mentioned that in the first line of the github readme, not burried deep down in the text.

Also worth noting that the exploit was published nearly decade ago. Still, even at that time, those VIA CPUs were over 15 years old.

It's not even a "backdoor", it's documented in the datasheet...

http://datasheets.chipdb.org/VIA/Nehemiah/VIA%20C3%20Nehemia... (page 82)

...which along with the already publicly-known microarchitecture of the C3 makes this statement sound like total nonsense:

The rosenbridge backdoor is a small, non-x86 core embedded alongside the main x86 core in the CPU

I remember laughing at this with a few others knowledgeable in x86 when it first came out; a self-proclaimed "security researcher" who somehow failed to RTFM.

There's even a Wikipedia article about it now, with a link to the alternate instruction set documentation: https://en.wikipedia.org/wiki/Alternate_Instruction_Set