The patch for CESA-2017:2563 announced at https://lists.CentOS.org/pipermail/CentOS-announce/2017-August/022529.html is only available in the CentOS 6.9 repo. It is missing for the generic CentOS-6 repo at http://mirror.CentOS.org/CentOS-6/6/os/x86_64/Package..

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