linux-kernel - Re: CVE-2021-47574: xen/netfront: harden netfront against event channel storms

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Message-ID: <87d1ece9-246f-4e53-bb7d-4cd965d56dbd@suse.com>
Date: Thu, 20 Jun 2024 09:54:11 +0200
From: Juergen Gross <jgross@...e.com>
To: cve@...nel.org, linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
 "security@...project.org" <security@...project.org>
Subject: Re: CVE-2021-47574: xen/netfront: harden netfront against event
 channel storms

On 19.06.24 16:54, Greg Kroah-Hartman wrote:
> Description
> ===========
> 
> In the Linux kernel, the following vulnerability has been resolved:
> 
> xen/netfront: harden netfront against event channel storms
> 
> The Xen netfront driver is still vulnerable for an attack via excessive
> number of events sent by the backend. Fix that by using lateeoi event
> channels.
> 
> For being able to detect the case of no rx responses being added while
> the carrier is down a new lock is needed in order to update and test
> rsp_cons and the number of seen unconsumed responses atomically.
> 
> This is part of XSA-391

When issuing XSA-391 the Xen security team already assigned CVE-2021-28712
to this issue.


Juergen

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