The mem_cgroup_usage_unregister_event function in mm/memcontrol.c in the Linux kernel before 3.2.10 does not properly handle multiple events that are attached to the same eventfd, which allows local users to cause a denial of service (NULL pointer dereference and system crash) or possibly have unspecified other impact by registering memory threshold events.
git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=371528caec553785c37f73fa3926ea0de84f986f
lists.fedoraproject.org/pipermail/package-announce/2012-March/075781.html
lists.opensuse.org/opensuse-security-announce/2012-04/msg00021.html
secunia.com/advisories/48898
secunia.com/advisories/48964
www.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.2.10
www.openwall.com/lists/oss-security/2012/03/07/3
bugzilla.redhat.com/show_bug.cgi?id=800813
exchange.xforce.ibmcloud.com/vulnerabilities/73711
github.com/torvalds/linux/commit/371528caec553785c37f73fa3926ea0de84f986f