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Date: Tue, 12 Aug 2014 22:43:00 -0700
From: Andy Lutomirski <>
Subject: Re: CVE Request: ro bind mount bypass using user namespaces

On Tue, Aug 12, 2014 at 10:04 PM, Andy Lutomirski <> wrote:
> On Tue, Aug 12, 2014 at 4:54 PM, Andy Lutomirski <> wrote:
>> On 08/12/2014 02:48 PM, Kenton Varda wrote:
>>> Due to a bug in the Linux kernel's implementation of remount, on systems
>>> with unprivileged user namespaces enabled, it is possible for an
>>> unprivileged user to gain write access to any visible read-only bind mount.
>>> It is also possible to bypass flags like nodev, nosuid, and noexec.


> Yup.  I have a fairly reliable exploit now.  Will post the code in a
> couple of weeks.

To clarify: my exploit has nothing to do with sandboxing.  It roots
default-ish configurations of Fedora 20 and Ubuntu 14.04.


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