FYI: according to iucode_tool, there are no microcode updates in the 20151106 microcode updates from https://downloadcenter.intel.com/search?keyword=Linux*+Processor+Microcode+Data+File > /usr/sbin/iucode_tool -tb -lS <path_to_extracted_microcodes> /usr/sbin/iucode_tool: system has processor(s) with signature 0x000506e3 selected microcodes: >