iDefense Security Advisory 05.14.09 -Local exploitation of an index validation vulnerability in Apple Inc.'s Mac OS X xnu kernel could allow an attacker to execute arbitrary code in the security context of the kernel. The Mac OS X xnu (Mach) kernel implements workqueues. This allows the kernel to schedule events to take place in a task. An input validation error exists within this implementation, which can lead to execution of arbitrary code in the kernel. Apple Inc.'s Mac OS X 10.5.2 and earlier is considered vulnerable to this issue.
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