Comment by bratch

The package contains microcode for old CPUs but it isn't necessarily still updated or recent.

Here for example is what's available for my router's CPU, from the latest package:

  # grep model\ name /proc/cpuinfo
  model name      : Intel(R) Core(TM)2 Duo CPU     E4500  @ 2.20GHz

  # iucode_tool -S -l /lib/firmware/intel-ucode/* | tail -n1
  iucode_tool: system has processor(s) with signature 0x000006fd
    030/003: sig 0x000006fd, pf_mask 0x01, 2010-10-02, rev 0x00a4, size 4096

Last updated almost eight years ago, so doesn't contain any Spectre/Meltdown fixes.