|Red Hat Enterprise Linux 4: System Administration Guide|
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There are several ways to determine if an updated kernel is available for the system.
Security Errata — Go to the following location for information on security errata, including kernel upgrades that fix security issues:
Via Quarterly Updates — Refer to the following location for details:
Via Red Hat Network — Download and install the kernel RPM packages. Red Hat Network can download the latest kernel, upgrade the kernel on the system, create an initial RAM disk image if needed, and configure the boot loader to boot the new kernel. For more information, refer to http://www.redhat.com/docs/manuals/RHNetwork/.
If Red Hat Network was used to download and install the updated kernel, follow the instructions in Section 29.5 Verifying the Initial RAM Disk Image and Section 29.6 Verifying the Boot Loader, only do not change the kernel to boot by default. Red Hat Network automatically changes the default kernel to the latest version. To install the kernel manually, continue to Section 29.4 Performing the Upgrade.