AMD Releases Updated Zen 3 CPU Microcode (November 2021)

Written by Michael Larabel in AMD on 15 November 2021 at 02:09 PM EST. 6 Comments
A new Family 19h microcode binary was merged today into the linux-firmware.git repository that serves as the central source for all of the binary firmware/microcode files for Linux systems.

The updated AMD Family 19h "Zen 3" microcode was committed today to linux-firmware.git. Unfortunately, as usual, there isn't any public change-log to note what has changed with this AMD CPU microcode revision.

This update though does come just days after the AMD-SB-1021 security bulletin. That AMD security bulletin for November 2021 noted a wide number of CVEs (including several "high" severity) issues affecting their EPYC processors. Those CVEs included vulnerabilities in the PSP, SMU, and other CPU-related issues.

AMD is releasing new AGESA for mitigating those issues and should be pushed down soon as BIOS updates by various server/motherboard vendors. I'm waiting to hear back if today's CPU microcode update is related to last week's disclosures or if there is anything else of note with today's revision.
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