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Date: Wed, 13 Aug 2014 17:35:23 +0200
From: Yves-Alexis Perez <>
Subject: Re: CVE Request: ro bind mount bypass using user

On Tue, Aug 12, 2014 at 02:48:28PM -0700, 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.
So that means running with both USER_NS=y and


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