Updated packages have been posted for testing: ftp://ftp.scientificlinux.org/linux/scientific/6rolling/testing/i386/ ftp://ftp.scientificlinux.org/linux/scientific/6rolling/testing/x86_64/ With the upstream release of EL6.6 there are a number of security errata packages which may have a fundamental impact on all SL6 systems. To help ensure these are rolled out safely we have posted them in the SL6 Testing repo. Unless critical bugs are reported these packages will be pushed into SL6 on Nov 3 2014. All SL6 users are encouraged to select a non-production system and test the application of these updates. There are over 250 packages just pushed into the SL6 Testing repo for evaluation, and as such we cannot list them all in a concise manner. High profile packages include: cups firefox glibc gtk2 kerberos kernel thunderbird xorg You can install this update for testing via the sl-testing repo on your SL system: yum --enablerepo=sl-testing update