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Two Hidden Instructions Discovered in Intel CPUs Enable Microcode Modification
Two Hidden Instructions Discovered in Intel CPUs Enable Microcode Modification .
Security researchers Mark Ermolov, Dmitry Sklyarov, and Maxim Goryachy discovered two undocumented x86 instructions that can be used to modify the CPU microcode. The instructions can only be executed when the CPU runs in debug mode, which makes them not easily exploitable, though.
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OvermindDL1
Why does Intel keep having and adding so so so very many instructions that are undocumented in every form… It’s so horrible from a security standpoint (hence why so many theories that a lot of these are for exploitations) and it just complicates the chips even further. We need everything to switch to RISC-V or something, and keep it to the spec… >.>
AstonJ
Nothing would surprise me tbh, good job we got a Ethics & Privacy section to keep tabs on stuff like this 
dimitarvp
One more reason to go full AMD, assuming they don’t do the same of course…
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