Journald warning kernel 6.6.x-x missing microcode

Warnings in journalctl kernels 6.6.2-5 / 6.6.2-7 /

archlinux kernel: Speculative Return Stack Overflow: IBPB-extending microcode not applied!

archlinux kernel: Speculative Return Stack Overflow: WARNING: See for mitigation options.

Guess I’m waiting on my microcode…

$ cat /sys/devices/system/cpu/vulnerabilities/spec_rstack_overflow

Vulnerable: Safe RET, no microcode

Or who knows maybe I’ll use spec_rstack_overflow=off to cut the performance hit, as …

1 Like

Old warnings have gone.
New on 4.Dez.2023: archlinux kernel: Zenbleed: please update your microcode for the most optimal fix.
EDIT: amd-ucode 20231110.74158e7a-1 - of Mi 22 Nov 2023 - does not cover this…

I had bookmarked this to remind me again in however long.
Things are pretty much the same.
Except been rocking the option above so now its

$ cat /sys/devices/system/cpu/vulnerabilities/spec_rstack_overflow
Vulnerable: No microcode

Mitigation: Safe RET