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Date: Wed, 16 Jul 2014 22:50:37 -0700
From: Kees Cook <>
Subject: CVE-2014-4943: Linux privilege escalation in ppp over l2tp sockets

CVE-2014-4943 is a flaw in the Linux kernel allowing an unprivileged user
to escalate to kernel privilege when CONFIG_PPPOL2TP is enabled. If built
as a module, a work-around to limit this to just the root user would be
to add this to /etc/modprobe.conf:

alias pppox-proto-1 off
blacklist l2tp_ppp

Upstream commit:


Kees Cook                                  

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