Off-by-one error in the dwarf_to_unw_regnum function in include/dwarf_i.h in libunwind 1.1 allows local users to have unspecified impact via invalid dwarf opcodes.
http://www.securityfocus.com/bid/76707
http://rhn.redhat.com/errata/RHSA-2015-1769.html
http://rhn.redhat.com/errata/RHSA-2015-1768.html
http://rhn.redhat.com/errata/RHSA-2015-1675.html
http://git.savannah.gnu.org/cgit/libunwind.git/commit/?id=396b6c7ab737e2bff244d640601c436a26260ca1