Here's a major security update that may have slipped under the (mainstream media) radar.
The new version of RHEL (Red Hat Enterprise Linux) desktop includes fixes for a wide range of vulnerabilities, some rated "critical."
An advisory from Red Hat provides links to 11 security issues covering more than 40 flaws affecting installations of its open-source operating system.
Three of the 11 carry a "critical" severity rating (Firefox, Thunderbird and ekiga) while four are rated "important." One of the "important" fix applies to the kernel.
The RHEL v.5 update also fixes security holes in bind, samba, wireshark, postgresql, spamassassin, gnupg and xen.
[UPDATE: March 16, 2007 at 1:11 PM EST] Just a quick note to point out the Red Hat errata covers issues found between the time that RHEL5 went into complete freeze, and the time that it was released. All of the vulnerabilities mentioned were repaired in due time in previous versions of RHEL.