MobileInstallation in Apple iOS before 8.4 does not ensure the uniqueness of Watch bundle IDs, which allows attackers to cause a denial of service (ID collision and Watch launch outage) via a crafted universal provisioning profile app.
http://www.securitytracker.com/id/1032761
http://www.securityfocus.com/bid/75490
http://support.apple.com/kb/HT204941
http://lists.apple.com/archives/security-announce/2015/Jun/msg00001.html