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Date: Wed, 15 Apr 2015 18:55:01 +0100
From: Ben Hutchings <>
To: oss-security <>
Subject: Re: TCP Fast Open local DoS in some Linux stable branches

On Tue, 2015-04-14 at 21:24 +0100, Ben Hutchings wrote:
> There is a local DoS triggered by use of the TCP Fast Open option,
> specific to Linux stable branches, as a result of an incompletely
> backported bug fix:
> The 3.16.7-ckt stable branch is definitely affected, and I believe but
> haven't tested that the 3.10, 3.12, 3.13.11-ckt and 3.14 branches are
> also affected.
> Please assign a CVE ID for this.

As mitigation, TCP Fast Open can be disabled by setting sysctl
net.ipv4.tcp_fastopen=0.  It was disabled by default before Linux 3.13.


Ben Hutchings
Editing code like this is akin to sticking plasters on the bleeding stump
of a severed limb. - me, 29 June 1999

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