Hi Borislav,
On Sat, Oct 18, 2025 at 12:03:14PM +0200, Borislav Petkov wrote:
This was observed on more than 1 Zen5 model, so it should be disabled for all of Zen5 until/unless a comprehensive blacklist can be built.
As I said the last time, we're working on it. Be patient pls.
While your team is checking into this, I'd be most interested to know one way or the other whether this affects RDRAND too. Since RDRAND uses the same source as RDSEED for seeding its DRBG, I could imagine it triggering this bug too (in unlikely circumstances), and then generating random looking output that's actually based on a key that has some runs of zeros in it. We'd have a hard time figuring this out from looking at the output (or even triggering it deliberately), but it seems like something that should be knowable by the team doing root cause analysis of the RDSEED bug.
Thanks, Jason