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Date: Tue, 14 Nov 2023 13:58:21 -0500
From: Demi Marie Obenour <>
Subject: Re: CVE-2023-23583: Intel - Denial of Service -
 Privilege Escalation (Reptar)

On Tue, Nov 14, 2023 at 10:31:51AM -0800, Antonio Gomez Iglesias wrote:
> Name of the issue: Redundant Prefix Issue
> Description of the issue
> Under certain microarchitectural conditions, Intel has identified cases
> where execution of an instruction (REP MOVSB) encoded with a redundant
> REX prefix may result in unpredictable system behavior resulting in a
> system crash/hang, or, in some limited scenarios, may allow escalation
> of privilege from CPL3 to CPL0.
> This Redundant Prefix Issue is assigned CVE-2023-23583 with a CVSS Base
> Score of 8.8 High CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H.
> Mitigation
> Intel is providing a microcode update to mitigate this issue:

Does this also allow privilege escalation from a VM guest to the host?
What are the limited scenarios?
Demi Marie Obenour (she/her/hers)
Invisible Things Lab

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