The kernel packages contain the Linux kernel, the core of any Linuxoperating system.Security fixes:Red Hat would like to thank Dan Rosenberg for reporting CVE-2010-3442.Bug fixes:time.c: Using PM based timekeepingFine grained accounting for the PM timer is introduced which eliminatesthis issue. However, this fix uncovered a bug in the Xen hypervisor,possibly causing backward time drift. If this erratum is installed in XenHVM guests that meet the aforementioned conditions, it is recommended thatthe host use kernel-xen-2.6.18-194.26.1.el5 or newer, which includes a fix(BZ#641915) for the backward time drift. (BZ#629237)Users should upgrade to these updated packages, which contain backportedpatches to correct these issues. The system must be rebooted for thisupdate to take effect.