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Date: Sun, 14 Aug 2016 21:36:39 +0200
From: Sona Sarmadi <>
To: <>
Subject: Re: CVE-2016-5696: linux kernel - challange ack
 information leak.

Hi all,

This vulnerability is currently only fixed in mainline kernels (4.7 &
4.8). Does anyone know if there is any work ongoing to backport this fix
to the  older versions?


On 2016-07-12 06:33, Wade Mealing wrote:
> Gday,
> Red Hat Product Security has been made aware of an important issue in
> the Linux kernel's implementation of challenge ACKS as specified in
> RFC 5961. An attacker which knows a connections client IP, server IP
> and server port can abuse the challenge ACK mechanism
> to determine the accuracy of a normally 'blind' attack on the client or server.
> Successful exploitation of this flaw could allow a remote attacker to
> inject or control a TCP stream contents in a connection between a
> Linux device and its connected client/server.
> * This does NOT mean that cryptographic information is exposed.
> * This is not a Man in the Middle (MITM) attack.
> This was reported to Red Hat by Yue Cao, part of the Cyber Security
> Group in the University of California
> Thanks,
> Wade Mealing
> Red Hat Product Security Team
> Red Hat Bugzilla:
> Patch:

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