Date: Tue, 12 Jul 2022 21:27:07 +0200 From: Salvatore Bonaccorso <carnil@...ian.org> To: oss-security@...ts.openwall.com Cc: xen-announce@...ts.xen.org, xen-devel@...ts.xen.org, xen-users@...ts.xen.org, "Xen.org security team" <security-team-members@....org> Subject: Re: Xen Security Advisory 407 v1 (CVE-2022-23816,CVE-2022-23825,CVE-2022-29900) - Retbleed - arbitrary speculative code execution with return instructions Hi, On Tue, Jul 12, 2022 at 04:36:10PM +0000, Xen.org security team wrote: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA256 > > Xen Security Advisory CVE-2022-23816,CVE-2022-23825,CVE-2022-29900 / XSA-407 > > Retbleed - arbitrary speculative code execution with return instructions > > ISSUE DESCRIPTION > ================= > > Researchers at ETH Zurich have discovered Retbleed, allowing for > arbitrary speculative execution in a victim context. > > For more details, see: > https://comsec.ethz.ch/retbleed > > ETH Zurich have allocated CVE-2022-29900 for AMD and CVE-2022-29901 for > Intel. > > Despite the similar preconditions, these are very different > microarchitectural behaviours between vendors. > > On AMD CPUs, Retbleed is one specific instance of a more general > microarchitectural behaviour called Branch Type Confusion. AMD have > assigned CVE-2022-23816 (Retbleed) and CVE-2022-23825 (Branch Type > Confusion). > > For more details, see: > https://www.amd.com/en/corporate/product-security/bulletin/amd-sb-1037 Is it confirmed that AMD is not using CVE-2022-29900? The above amd-sb-1037 references as well both CVE-2022-23825 (Branch Type Confusion) and CVE-2022-29900 (RETbleed), so I assume they agreed to use CVE-2022-29900 for retbleed? So should the Xen advisory as well use CVE-2022-23825,CVE-2022-29900 and CVE-2022-29901? Regards, Salvatore
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