Has anyone disassembled that update to figure out how they patched this? If it is some device sitting on the memory bus, how did they disable it in a way it co

Has anyone disassembled that update to figure out how they patched this? If it is some device sitting on the memory bus, how did they disable it in a way it couldn't be reenabled by the OS kernel? Most hardware that sits on a CPU bus doesn't have such an ability.