Mike O'Connor reported a local DoS on ia64 to vendor-sec on Jan 21 with a demo exploit. This issue is embargoed with no date currently set. The fix has been applied to 2.6: http://linux.bkbits.net:8080/linux-2.6/cset@41f2beablXVnAs_6fznhhITh1j5hZg
public, removing embargo
An advisory has been issued which should help the problem described in this bug report. This report is therefore being closed with a resolution of ERRATA. For more information on the solution and/or where to find the updated files, please follow the link below. You may reopen this bug report if the solution does not work for you. http://rhn.redhat.com/errata/RHSA-2005-366.html