The Performance Events subsystem in the Linux kernel before 3.1 does not properly handle event overflows associated with PERF_COUNT_SW_CPU_CLOCK events, which allows local users to cause a denial of service (system hang) via a crafted application.
git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=a8b0ca17b80e92faab46ee7179ba9e99ccb61233
www.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.1
www.openwall.com/lists/oss-security/2011/08/16/1
bugzilla.redhat.com/show_bug.cgi?id=730706
github.com/torvalds/linux/commit/a8b0ca17b80e92faab46ee7179ba9e99ccb61233