The create_user_ns function in kernel/user_namespace.c in the Linux
kernel before 3.8.6 does not check whether a chroot directory exists
that differs from the namespace root directory, which allows local
users to bypass intended filesystem restrictions via a crafted clone
Note:References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MLIST:[oss-security] 20130416 Re: Re: Summary of security bugs (now fixed) in user namespaces
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