The Accelerate Framework component in Apple iOS before 9.1 and OS X before 10.11.1, when multi-threading is enabled, omits certain validation and locking steps, which allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption) via a crafted web site.
Improper Restriction of Operations within the Bounds of a Memory Buffer The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary.