Integer overflow in the ib_uverbs_poll_cq function in drivers/infiniband/core/uverbs_cmd.c in the Linux kernel before 2.6.37 allows local users to cause a denial of service (memory corruption) or possibly have unspecified other impact via a large value of a certain structure member.
http://rhn.redhat.com/errata/RHSA-2011-0927.html
http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.37