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Date: Mon, 12 May 2014 21:15:10 +1200
From: Matthew Daley <>
Subject: Re: CVE-2014-0196: Linux kernel pty layer race
 condition memory corruption


I've written a "slightly-less-than-POC" privilege escalation exploit for
this vulnerability that works on newer kernels: (SHA1:

Note the warning mentioned in the header; run it at your own risk ;)

- Matthew Daley

On Mon, May 5, 2014 at 10:08 PM, Marcus Meissner <> wrote:

> Hi,
> SUSE customer Ericsson reported a kernel crash to us which turned out
> to be a race condition in the PTY write buffer handling.
> When two processes/threads write to the same pty, the buffer end could
> be overwritten and so memory corruption into adjacent buffers could lead
> to crashes / code execution.
> Jiri Slaby and Peter Hurley localized and fixed this problem.
> CVE-2014-0196 has been assigned to this issue.
> Jiri thinks this was introduced during 2.6.31 development by
> d945cb9cce20ac7143c2de8d88b187f62db99bdc (pty: Rework the pty
> layer to use the normal buffering logic) in 2.6.31-rc3. Until then, pty
> was writing directly to a line discipline without using buffers.
> Patch is also attached.
> Ciao, Marcus

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