Date: Tue, 14 Nov 2023 20:24:02 +0100 From: Solar Designer <solar@...nwall.com> To: oss-security@...ts.openwall.com Cc: Antonio Gomez Iglesias <antonio.gomez.iglesias@...el.com>, Tavis Ormandy <taviso@...il.com> Subject: Re: CVE-2023-23583: Intel - Denial of Service - Privilege Escalation (Reptar) On Tue, Nov 14, 2023 at 01:58:21PM -0500, Demi Marie Obenour wrote: > Does this also allow privilege escalation from a VM guest to the host? Per Tavis' writeup, this at least allows a VM guest to trigger machine check exceptions and halt the host. So it's at least a DoS. My reading is this can cause wrong control flow at least in SMT sibling threads, so is a privilege escalation risk from VMs at least when SMT is enabled. Without SMT, it's still at least a DoS. > What are the limited scenarios? I would like to know this, too. I doubt it's been fully researched. Alexander
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