A carry propagation issue was found in the P-256 implementation for x86-64 in golang.
Created golang tracking bugs for this issue:
Affects: epel-6 [bug 1455190]
Affects: fedora-all [bug 1455191]
This issue has been addressed in the following products:
Red Hat Enterprise Linux 7
Via RHSA-2017:1859 https://access.redhat.com/errata/RHSA-2017:1859