As mentioned in this advisory on the Secunia website (reposted from the original advisory) the Fedora Linux group has posted an update for their PHP package to bring it up to date with the recent PHP 5.2.4 release.

Fedora has issued an update for php. This fixes a weakness and some vulnerabilities, where some have unknown impacts and others can be exploited by malicious users and malicious, local users to bypass certain security restrictions.

You can find the complete list of packages that were updated in their advisory posting and a brief mention of the easiest way for you to update your distribution (yum).