| Description: | Integer overflow in the perf_event_interrupt function in arch/powerpc/kernel/perf_event.c in the Linux kernel before 2.6.39 on powerpc platforms allows local users to cause a denial of service (unhandled performance monitor exception) via vectors that trigger certain outcomes of performance events. Maynard Johnson discovered that on POWER7, certain speculative events may raise a performance monitor exception. A local attacker could exploit this to crash the system, leading to a denial of service.
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