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Ensure the existence of /sys/devices/system/cpu/microcode/reloadĢ.
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To update the intel-ucode package to the system, one need:ġ. It's generally located in the /lib/firmware directory,Īnd can be updated throught the microcode reload interface. The file is supported in most modern Linuxĭistributions. Intel-ucode dirctory contains binary microcode files named inįamily-model-stepping pattern. Ensure the existence of /dev/cpu/microcodeĭd if=microcode.dat of=/dev/cpu/microcode bs=1M To update the microcode.dat to the system, one need:ġ. Update interface which is avaialble in the kernel with It can be updated to the system through the old microcode Microcode.dat is in a traditional text format. This package contains Intel microcode files in two formats:
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The full instructions from the Intel microcode release can be found here: - Microcode update instructions. You can see an example of how NickAu, one of the BleepingComputer moderators, installed the updates manually in Ubuntu here. In modern Linux distributions this is typically done by copying the downloaded intel-ucode folder into the /lib/firmware folder and then running the echo 1 > /sys/devices/system/cpu/microcode/ reload command.
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If you are unable to install an update through a package manager you can also install the microcodes manually. Redhat and Centos users can use yum and should search for microcode_ctl. The package manager will also install any other dependencies needed such as iucode-tool. To install a new microcode update, the best method is to use the package manager that is included with your Linux distribution.įor Debian and Ubuntu distributions, you should use apt to install the intel-microcode packages. Applying the new microcode data files to Linuxįor Linux users, applying a new microcode data file is fairly easy as Linux distributions typically release them as an update when they become available. It is not currently known if Microsoft will be releasing the new microcodes in a future update. The last microcode update, other than hotfixes, was released in 2015. Windows users can also benefit from updated microcodes, but these need to be first tested by Microsoft and then released as an update. 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.įor example, if you look up the Haswell processor that has an identifier of (06-3c-03:32) at, you will see that the information on the site matches the identifier listed in the release notes. The format is (family-model-stepping:unknown) with the values being in hexadecimal. Below are the list of processors from the release notes that received updates.īased on information found here and on Intel's site, the first column is processor model, the second column is the abbreviation from the release notes, and the third is the new revision numbers from the release notes.Īnother reader pointed out that the numbers in parenthesis coincide with the CPUs family, model, and stepping.
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Using microcode files, an operating system can fix known bugs in Intel CPU without having to perform a BIOS update on the computer.Īccording 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.Īs pointed out in a comment to this article, this microcode release only fixes issues in certain processors. 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.