Adobe Reader 9.3.1 fixes a critical security issue: http://www.adobe.com/support/security/bulletins/apsb10-07.html In addition, a critical vulnerability (CVE-2010-0188) has been identified that could cause the application to crash and could potentially allow an attacker to take control of the affected system.
This issue has been addressed in following products: Extras for RHEL 4 Extras for Red Hat Enterprise Linux 5 Via RHSA-2010:0114 https://rhn.redhat.com/errata/RHSA-2010-0114.html