On Tue, 29 Mar 2016, Steven Haigh wrote:

> RedHat seems to have something on this - but its locked behind the
> subscription:
>    https://access.redhat.com/solutions/29845
>
> If its only the overnight cron you get it from, it may be good enough to
> modify /etc/sysconfig/yum-autoupdate and add "yum clean all" to PRERUN.
>
> I note that I only ever get these from 7.x systems. 6.x doesn't seem to
> throw this at all.

I have seen it on my SL6 home machine occasionally.

As others say, yum clean seems to help.