linux-kernel - Re: CVE-2021-47377: kernel: xen/balloon: use a kernel thread instead a workqueue

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Message-ID: <2024052826-overpass-manliness-7f2c@gregkh>
Date: Tue, 28 May 2024 21:03:01 +0200
From: Greg KH <gregkh@...uxfoundation.org>
To: Juergen Gross <jgross@...e.com>
Cc: cve@...nel.org, linux-cve-announce@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	"xen-devel@...ts.xenproject.org" <xen-devel@...ts.xenproject.org>,
	"Xen.org security team" <security@....org>
Subject: Re: CVE-2021-47377: kernel: xen/balloon: use a kernel thread instead
 a workqueue

On Mon, May 27, 2024 at 12:58:16PM +0200, Juergen Gross wrote:
> Hi,
> 
> I'd like to dispute CVE-2021-47377: the issue fixed by upstream commit
> 8480ed9c2bbd56fc86524998e5f2e3e22f5038f6 can in no way be triggered by
> an unprivileged user or by a remote attack of the system, as it requires
> initiation of memory ballooning of the running system. This can be done
> only by either a host admin or by an admin of the guest which might
> suffer the detection of the hanging workqueue.
> 
> Please revoke this CVE.

Ah, good catch, this came in as part of the GSD import, and I missed
that this required that type of permissions.  Now revoked, thanks for
the review!

greg k-h