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Date: Tue, 14 Nov 2023 20:24:02 +0100
From: Solar Designer <>
Cc: Antonio Gomez Iglesias <>,
	Tavis Ormandy <>
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.


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