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Date: Tue, 25 Jul 2023 13:58:54 -0400
From: Demi Marie Obenour <>
Subject: Re: CVE-2023-20593: A use-after-free in AMD Zen2

On Tue, Jul 25, 2023 at 06:12:44PM +0100, Eddie Chapman wrote:
> alice wrote:
> > this is a disaster of a security announcement from AMD. nothing is fixed
> > except for epyc. the only workaround anyone really has is the chicken bit,
> > thankfully.
> Yes, very disappointing. Pure speculation; perhaps they were planning on
> disclosing at the end of the year with full set of Microcode ready but
> something we don't know (yet) forced them to disclose early. Who knows.

Does AMD make OS-loadable ╬╝code patches available for client platforms,
or must all ╬╝code loading on clients be done by the firmware?  If the
latter, then it will take a very long time for clients to get patched,
even if AMD released the updates promptly.  Also, server platforms can
usually reflash the firmware via the BMC, but client platforms do not
have this option.
Demi Marie Obenour (she/her/hers)
Invisible Things Lab

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