some info if interested:
https://blog.qualys.com/securitylabs/2017/06/19/the-stack-clash
https://access.redhat.com/security/vulnerabilities/stackguard
centos packages:
centos 7:
https://lists.centos.org/pipermail/centos-announce/2017-June/022464.html
https://lists.centos.org/pipermail/centos-announce/2017-June/022463.html
centos6:
https://lists.centos.org/pipermail/centos-announce/2017-June/022461.html
https://lists.centos.org/pipermail/centos-announce/2017-June/022462.html