The default configuration for autofs 5 (autofs5) in some Linux distributions, such as Red Hat Enterprise Linux (RHEL) 4 and 5, does not specify the nodev mount option for the -hosts map, which allows local users to access "important devices" by operating a remote NFS server and creating special device files on that server, as demonstrated by the /dev/mem device.
https://www.redhat.com/archives/fedora-package-announce/2007-December/msg00732.html
https://www.redhat.com/archives/fedora-package-announce/2007-December/msg00726.html
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A11457
https://exchange.xforce.ibmcloud.com/vulnerabilities/39188
https://bugzilla.redhat.com/show_bug.cgi?id=426218
http://www.securityfocus.com/bid/26970
http://www.mandriva.com/security/advisories?name=MDVSA-2008:009
http://securitytracker.com/id?1019137
http://secunia.com/advisories/28456
http://secunia.com/advisories/28168
http://secunia.com/advisories/28156
http://rhn.redhat.com/errata/RHSA-2007-1177.html