Due to a problem with the patch used to correct a problem with LDAP servers not correctly returning an opaque cookie to check for additional results when getting paged results from a server on 64-bit PowerPC and IBM System z platforms (RHBA-2012:0264), it was possible for a user to cause a denial of service of the autofs service. While this may not impact mounts that have already been mounted (other than preventing mount expiration), it will prevent any future mount requests from being processed until autofs is restarted.
Red Hat would like to thank Ray Rocker for reporting this issue.
This issue has been addressed in following products:
Red Hat Enterprise Linux 5
Via RHSA-2013:0132 https://rhn.redhat.com/errata/RHSA-2013-0132.html