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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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