The ERRATA for SL 55,54,53,52,51,50 i386 x86_64 are now available from:
ftp://ftp.scientificlinux.org/linux/scientific/(55,54,53,52,51,50)/i386/updates/security/

These are all because of missing dependencies.

SL 50-52 modcluster-0.12.1-2.el5.i386.rpm  --  ricci - requires newer version
SL 50-53 pth-2.0.7-6.el5.i386.rpm	   --  gnupg2 - new dependency
SL 50-53 pth-devel-2.0.7-6.el5.i386.rpm 
SL 50-54 xz-4.999.9-0.3.beta.20091007git.el5.i386.rpm  - libvirt - new dependency
SL 50-54 xz-devel-4.999.9-0.3.beta.20091007git.el5.i386.rpm
SL 50-54 xz-libs-4.999.9-0.3.beta.20091007git.el5.i386.rpm
SL 50-54 xz-lzma-compat-4.999.9-0.3.beta.20091007git.el5.i386.rpm

SL 50-55

 	ebtables-2.0.9-5.el5.i386.rpm   - libvirt - new dependency
 	libselinux-1.33.4-5.7.el5.i386.rpm - libvirt - newer version
 	libselinux-devel-1.33.4-5.7.el5.i386.rpm
 	libselinux-python-1.33.4-5.7.el5.i386.rpm
 	libselinux-ruby-1.33.4-5.7.el5.i386.rpm
 	libselinux-utils-1.33.4-5.7.el5.i386.rpm

-Connie Sieh