Date: Tue, 25 Jul 2023 14:30:43 -0400 From: Jeffrey Walton <noloader@...il.com> To: oss-security@...ts.openwall.com Subject: Re: CVE-2023-20593: A use-after-free in AMD Zen2 Processors On Tue, Jul 25, 2023 at 2:14 PM Demi Marie Obenour <demi@...isiblethingslab.com> 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 μcode patches available for client platforms, > or must all μcode 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. Related, Ubuntu released an updated amd64-microcode around (or before) 1:45 PM EST today. My Ubuntu machines have already been patched. I was kind of surprised to see how quickly it landed. Jeff
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