It appears that when errata rpms were added on 7/22 to 

ftp://ftp.scientificlinux.org/linux/scientific/40rolling/i386/errata/SL/RPMS/

the repodata was not rebuilt.

These same errata seem not to have been put in 

ftp://ftp.scientificlinux.org/linux/scientific/41/i386/errata/SL/RPMS/