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

[Willem de Bruijn]

On Thu, Aug 29, 2024 at 12:58 PM Greg Kroah-Hartman
<gregkh@xxxxxxxxxxxxxxxxxxx> wrote:
>
> On Thu, Aug 29, 2024 at 12:53:34PM -0400, Willem de Bruijn wrote:
> > On Thu, Aug 29, 2024 at 12:18 PM Michal Koutný <mkoutny@xxxxxxxx> wrote:
> > >
> > > On Wed, Aug 28, 2024 at 09:30:08AM GMT, Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> 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.
> >
>
> Ok, should it be rejected then?  If so, just let me know.

It is a legitimate bug fix, definitely stable material.

With the fix backported to all these branches, not sure what, if
anything, more is needed wrt the CVE.