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Date: Tue, 25 Jul 2023 20:14:01 +0200
From: Lucas Rolff <>
Subject: Re: CVE-2023-20593: A use-after-free in AMD Zen2

OS vendors can include it in microcode updates just fine assuming the change is minor (Spectre/Meltdown did take quite some time to iron out stability to live patch it).

> On 25 Jul 2023, at 19:58, Demi Marie Obenour <> wrote:
> 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.
> -- 
> Sincerely,
> Demi Marie Obenour (she/her/hers)
> Invisible Things Lab

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