CentOS Errata and Security Advisory 2009:0135
https://rhn.redhat.com/errata/RHSA-2008-0135.html
The following updated files have been uploaded and are currently syncing to the mirrors:
s390: updates/s390/RPMS/tk-8.4.7-3.c4.1.s390.rpm updates/s390/RPMS/tk-devel-8.4.7-3.c4.1.s390.rpm
s390x: updates/s390x/RPMS/tk-8.4.7-3.c4.1.s390x.rpm updates/s390x/RPMS/tk-devel-8.4.7-3.c4.1.s390x.rpm