The init_posix_timers function in kernel/posix-timers.c in the Linux kernel before 2.6.31-rc6 allows local users to cause a denial of service (OOPS) or possibly gain privileges via a CLOCK_MONOTONIC_RAW clock_nanosleep call that triggers a NULL pointer dereference.
git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=70d715fd0597f18528f389b5ac59102263067744
lkml.org/lkml/2009/8/4/28
lkml.org/lkml/2009/8/4/40
secunia.com/advisories/36200
secunia.com/advisories/37105
www.kernel.org/pub/linux/kernel/v2.6/testing/ChangeLog-2.6.31-rc6
www.openwall.com/lists/oss-security/2009/08/06/2
www.ubuntu.com/usn/USN-852-1
www.vupen.com/english/advisories/2009/2197
exchange.xforce.ibmcloud.com/vulnerabilities/52317