[ubuntu-hardened] Overlayfs over Fuse Privilege Escalation in USERNS.

[daniel curtis]

Hello Seth and Steve

Thank You both for an answers and explanation. It's pretty interesting,
that an older Linux kernel seems to be more secure than in newer releases
etc. But as Steve wrote: "The thing that makes these issues exploitable is
that the kernel in Ubuntu 14.04 and newer supports unprivileged user
namespaces (...)".

One more thing: thanks for adjusting the priority for "Precise" in the CVE
tracker. I think that it was needed.

Thanks, best regards.
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