AMD immediately printed a brand new CPU microcode revision for Household 19h processors, which embody Zen 3 / Zen 3+ / Zen 4 processors. As is unfortunately customary, no change-log is supplied.
AMD Household 19h CPU microcode 2023-10-19 was added immediately to Linux-Firmware.Git, the de facto location the place CPU microcode/firmware binaries are housed for simple integration by Linux distributions and different software program distributors.
The commit updating the CPU microcode merely notes, “Replace AMD cpu microcode for processor household 19h” which is customary for the AMD microcode updates with very hardly ever outlining what fixes, safety updates, or different adjustments are made. The up to date CPU microcode is robotically utilized at boot-time on Linux programs or can alternatively be late-loaded as effectively for these wishing to keep away from the reboot/down-time.
The brand new microcode is the primary AMD Household 19h replace since August when AMD launched up to date CPU microcode for addressing the Inception vulnerability. Right now’s microcode push falls exterior of Patch Tuesday and there aren’t any new safety bulletins from AMD this week on the CPU aspect, so hopefully this quantities to only a routine replace for addressing practical points or different refinements. In any occasion I will be making an attempt out the brand new CPU microcode on AMD Zen 3/4 servers to look-out for any adjustments or efficiency variations.
