The scm_check_creds function in net/core/scm.c in the Linux kernel
before 3.8.6 does not properly enforce capability requirements for
controlling the PID value associated with a UNIX domain socket, which
allows local users to bypass intended access restrictions by
leveraging the time interval during which a user namespace has been
created but a PID namespace has not been created.
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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