It was reported  that busybox creates part of the /dev directory tree with incorrect permissions when creating device nodes in nested directories. This has been fixed  upstream.
Created busybox tracking bugs for this issue
Affects: fedora-all [bug 919610]
This issue has been addressed in following products:
Red Hat Enterprise Linux 6
Via RHSA-2013:1732 https://rhn.redhat.com/errata/RHSA-2013-1732.html