AMD yesterday upstreamed a batch of new CPU microcode files to linux-firmware.git as the de facto repository where component firmware/microcode is easily distributed to Linux distributions. This also marks the first time that Family 1Ah (Family 26) CPU microcode is updated there for the latest Zen 5 processors.

As is usually the case, unfortunately, there is no public change-log or any other insight into the changes of the new CPU microcode updates for Family 19h (Zen 3 / Zen 3+ / Zen 4) and Family 1Ah (Zen 5 so far). The [1]pull request simply notes:

- Update AMD cpu microcode for processor family 19h

- Add AMD cpu microcode for processor family 1ah

Key Name = AMD Microcode Signing Key (for signing microcode

container files only)

Key ID = F328AE73

Key Fingerprint = FC7C 6C50 5DAF CC14 7183 57CA E4BE 5339 F328 AE73

As it's not timed to a Patch Tuesday security disclosure, presumably the CPU microcode updates are just for functional issues and other random fixes. But we'll see.

In any event the new files are [2]out there for those interested in the updated CPU microcode for recent AMD Zen processors.



[1] https://gitlab.com/kernel-firmware/linux-firmware/-/merge_requests/629

[2] https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/commit/?id=3768c184de68a85b9df6697e7f93a2f61de90a99