Unknown cpu is detected updating bios is required
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The package contains microcode for all listed processors, but the updated microcode pertaining to Meltdown /Spectre mitigigation is limited to only certain processors.
Redhat and Centos users can use yum and should search for microcode_ctl. dd if=of=/dev/cpu/microcode bs=1M intel-ucode dirctory contains binary microcode files named in family-model-stepping pattern.
If you are unable to install an update through a package manager you can also install the microcodes manually. The file is supported in most modern Linux distributions.
On January 8th Intel released new Linux Processor microcode data files that can be used to mitigate the Spectre and and Meltdown vulnerabilities in Intel CPUs.
I did not install the Windows Update yet for meltdown.
For Debian and Ubuntu distributions, you should use apt to install the intel-microcode packages.
The package manager will also install any other dependencies needed such as iucode-tool.
You can find the values associated with a particular processor by looking it up on
We are still unsure what the value after the colon stands for.
According to the Intel microcode download page, this release is available for 40 different versions of Linux and valid for 2,371 Intel processors all the way down to the 150 mhz Pentium Processor from 1995.