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Date: Tue, 18 Jun 2019 01:19:11 +0400
From: Loganaden Velvindron <>
Cc: Security Report <>,
Subject: Re: Linux and FreeBSD Kernel: Multiple TCP-based
 remote denial of service issues

Can the netflix guys tell us if they have seen exploits in the wild ?

On Mon, Jun 17, 2019 at 10:56 PM Greg KH <> wrote:

> On Mon, Jun 17, 2019 at 10:33:38AM -0700, Security Report wrote:
> > Netflix has identified several TCP networking vulnerabilities in FreeBSD
> > and Linux kernels.
> >
> > The vulnerabilities specifically relate to the minimum segment size
> (MSS)
> > and TCP Selective Acknowledgement (SACK) capabilities. The most serious,
> > dubbed “SACK Panic,” allows a remotely-triggered kernel panic on recent
> > Linux kernels.
> >
> > There are patches that address most of these vulnerabilities. If patches
> > can not be applied, certain mitigations will be effective. We recommend
> > that affected parties enact one of those described below, based on their
> > environment.
> To answer all of the paniced emails I have already started to get, all
> of these patches are now in the following Linux stable kernel releases
> that just went out a few minutes ago:
>         4.4.182
>         4.9.182
>         4.14.127
>         4.19.52
>         5.1.11
> Other than the 3.16.y kernel branch, all other kernel branches are
> end-of-life, and will not be getting updates for these, or any other,
> bugfixes.  I do not know when/if Ben will be doing a release for 3.16.y
> with these fixes.
> thanks,
> greg k-h

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