CentOS - Jun 2009 - Odd module mentioned during update of kernel-PAE

During my update from 5.2 to 5.3 I saw these lines during the update
of kernel-PAE

  Installing     : kernel-PAE                                    [153/477]
Warning: Module vboxnetflt.ko from kernel 2.6.27.12-170.2.5.fc10.i686 has no
modversions, so it cannot be reused for kernel 2.6.18-128.1.14.el5PAE
Warning: Module vboxdrv.ko from kernel 2.6.27.12-170.2.5.fc10.i686 has no
modversions, so it cannot be reused for kernel 2.6.18-128.1.14.el5PAE

Now vbox is not installed on this machine.  However, it _is_ installed on
a machine that this one acts as an NFS server for (or will do, if I ever
get round to finishing the build).  And, yes, the kernel version mentioned
is for FC10...

% locate vboxnetflt.ko
/datadisk/exports/pugwash_fc10_root/lib/modules/2.6.26.5-45.fc9.i686/misc/vboxnetflt.ko
/datadisk/exports/pugwash_fc10_root/lib/modules/2.6.27.12-170.2.5.fc10.i686/extra/vboxnetflt.ko
/datadisk/exports/pugwash_fc10_root/lib/modules/2.6.27.5-41.fc9.i686/misc/vboxnetflt.ko
/datadisk/exports/pugwash_fc10_root/lib/modules/2.6.27.7-53.fc9.i686/misc/vboxnetflt.ko
/datadisk/exports/pugwash_fc10_root/lib/modules/2.6.27.9-159.fc10.i686/extra/vboxnetflt.ko
/datadisk/exports/pugwash_fc10_root/var/lib/dkms/vboxnetflt/2.1.0/2.6.27.12-170.2.5.fc10.i686/i686/module/vboxnetflt.ko
/datadisk/exports/pugwash_fc10_root/var/lib/dkms/vboxnetflt/2.1.0/2.6.27.9-159.fc10.i686/i686/module/vboxnetflt.ko
/datadisk/exports/pugwash_fc10_root/var/lib/dkms/vboxnetflt/original_module/2.6.27.9-159.fc10.i686/i686/vboxnetflt.ko


Why did the kernel-PAE update even look here?

*confused*

-- 

rgds
Stephen