https://downloadcenter.intel.com/download/27431/Linux-Processor-Microcode-Data-File
https://downloadcenter.intel.com/product/873/Processors
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=886367#17
https://www.dragonflydigest.com/2018/01/09/20710.html
https://launchpad.net/ubuntu/+source/intel-microcode/3.20180108.0~ubuntu16.04.2
https://bugs.launchpad.net/ubuntu/+source/intel-microcode/+bug/1742364
http://ftp.us.debian.org/debian/pool/non-free/i/intel-microcode/
see-also:
https://github.com/platomav/CPUMicrocodes
http://inertiawar.com/microcode/
https://www.cyberciti.biz/faq/install-update-intel-microcode-firmware-linux/
https://labs.vmware.com/flings/vmware-cpu-microcode-update-driver#summary
Firmware Security 
Note that Intel’s 2018-01-08 microcode release includes new updates for only a subset of the CPUs affected by Spectre. Updates for Broadwell-EP, Haswell-EP, and anything older, are still in the works, one assumes.
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