linux-kernel - Re: CVE-2022-48936: gso: do not skip outer ip header in case of ipip and net

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Message-ID: <CA+FuTSeHvADR5qbWnzRpYtpvNcvYrAeXAj8LYczUFLKREDwfpQ@mail.gmail.com>
Date: Thu, 29 Aug 2024 12:53:34 -0400
From: Willem de Bruijn <willemb@...gle.com>
To: Michal Koutný <mkoutny@...e.com>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, cve@...nel.org, 
	linux-kernel@...r.kernel.org, Tao Liu <thomas.liu@...oud.cn>
Subject: Re: CVE-2022-48936: gso: do not skip outer ip header in case of ipip
 and net_failover

On Thu, Aug 29, 2024 at 12:18 PM Michal Koutný <mkoutny@...e.com> wrote:
>
> On Wed, Aug 28, 2024 at 09:30:08AM GMT, Greg Kroah-Hartman <gregkh@...uxfoundation.org> wrote:
> > > What is the security issue here?
> >
> > This was assigned as part of the import of the Linux kernel GSD entries
> > into CVEs as required by the CVE board of directors (hence the 2022
> > date).  If you don't feel this should be assigned a CVE, just let me
> > know and I will be glad to reject it.
>
> The address of original author bounces back. Willem, could you please
> help explaining context of the change? (~the questions in my previous
> message).

I don't know why this has a CVE.

The patch reports that the negative effect is a drop due to a corrupted packet.

According to the CVE report this requires both user input with
virtio_net_hdr, which is privileged, and a tunnel device configured,
which again is privileged.