Kernel 2.4.24-linode19-1um brings us up to date with the latest Linux kernel version (2.4.24
changelog) which contains a local root exploit fix (details
here and
here), and also brings us up to date with the latest UML patch (2.4.23-1um).
How to Upgrade
See if you're already running 2.4.24-linode19-1um by viewing the output of "uname -a" inside your Linode. If not, follow this procedure:

Log into the Linode Platform Manager (LPM)

Configuration Profiles --> Click on your configuration profile

Make sure the Kernel drop-down has "
Latest 2.4 Series" selected and Save

Reboot your Linode
Thanks and enjoy!
-Chris