The Red Hat linux group has issued an update for their PHP packages today:

Red Hat has issued an update for php. This fixes some vulnerabilities, which can be exploited by malicious, local users to bypass certain security restrictions and by malicious people to bypass certain security restrictions and cause a DoS (Denial of Service).

You can get more information about this moderate level advisory from the Red Hat advisory including the affected products and the list of packages that should be updated to bring your installation up to date.