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

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Message-ID: <9fba239d-2e22-425b-b45f-86ecf016c2fd@suse.com>
Date: Mon, 27 May 2024 12:58:16 +0200
From: Juergen Gross <jgross@...e.com>
To: gregkh@...uxfoundation.org
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

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.

Juergen

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