http://www.jpcert.or.jp/at/2016/at160009.html

# rpm -qp --changelog glibc-2.12-1.166.el6_7.7.x86_64.rpm  | head
* Thu Jan 28 2016 Carlos O'Donell <carlos@redhat.com> - 2.12-1.166.7
- Update fix for CVE-2015-7547 (#1296028).

# rpm -qp glibc-2.17-106.el7_2.4.x86_64.rpm --changelog|head
* Fri Feb 05 2016 Florian Weimer <fweimer@redhat.com> - 2.17-106.4
- Revert problematic libresolv change, not needed for the
  CVE-2015-7547 fix (#1296030).