A temporary solution could be manually updating the content of
/lib/firmware/intel-ucode/, getting the ucode bins directly from the Intel
website​:
https://downloadcenter.intel.com/download/27337/Linux-Processor-Microcode-Data-File?product=873

intel-ucode dirctory contains binary microcode files named in
> family-model-stepping pattern. The file is supported in most modern Linux
> distributions. It's generally located in the /lib/firmware directory,
> and can be updated throught the microcode reload interface.
>
> To update the intel-ucode package to the system, one need:
> 1. Ensure the existence of /sys/devices/system/cpu/microcode/reload
> 2. Copy intel-ucode directory to /lib/firmware, overwrite the files in
> /lib/firmware/intel-ucode/
> 3. Write the reload interface to 1 to reload the microcode files, e.g.
>   echo 1 > /sys/devices/system/cpu/microcode/reload
>

This should contains _all_ latest available microcodes, including pieces
not shipped by microcode_ctl-2.1-22.2 (and in fact the Intel package has
more bin files in it). Not sure if this is enough.

Cheers,
Daniele

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