Red Hat and Apple have warned users of serious security flaws, including bugs in the Red Hat Enterprise Linux 4 kernel and Apple's WebObjects Xcode plug-in.
Red Hat advised users to upgrade the kernel in all RHEL 4-based systems due to a number of security flaws, including 11 it listed as "important". Another five were listed as having a "moderate" impact.
The more serious bugs affect basic components such as the IPv6, bridge, ATM and NFS client implementations. A flaw in the bridge implementation, for instance, can allow a remote user to cause forwarding of spoofed packets, while the ATM problem could allow a local user to cause a denial of service attack.
http://www.linuxlinks.com/portal/news/article.php?story=20060601133626455