The Common UNIX Printing System provides a portable printing layer for UNIX operating systems. The Internet Printing Protocol allows users to print and manage printing-related tasks over a network. A NULL pointer dereference flaw was found in the CUPS IPP routine, used for processing incoming IPP requests for the CUPS scheduler. An attacker could use this flaw to send specially-crafted IPP requests that would crash the cupsd daemon. Red Hat would like to thank Anibal Sacco from Core Security Technologies for reporting this issue. Users of cups are advised to upgrade to these updated packages, which contain a backported patch to correct this issue. After installing this update, the cupsd daemon will be restarted automatically.