The mach_port_kobject interface in the kernel in Apple iOS before 8.1.3 and Apple TV before 7.0.3 does not properly restrict kernel-address and heap-permutation information, which makes it easier for attackers to bypass the ASLR protection mechanism via a crafted app.
Apple Security Advisory 2015-03-09-3 - Security Update 2015-002 is now available and addresses buffer overflow, off-by-one, type confusion, and secure transport vulnerabilities.