I have 3 Redhat 5.x boxes all with Samba installed. After receiving the security flaw e-mail, I went to update samba on my 3 boxes. On the first box, it updated with no issues and now when I run the badlock-test.sh on that box, it is no longer vulnerable. But on my other two boxes, when I do a yum update samba I get the following:
[root@omnib2 mim]# yum update samba
Loaded plugins: product-id, rhnplugin, security, subscription-manager
This system is receiving updates from Red Hat Subscription Management.
This system is not registered with RHN Classic or RHN Satellite.
You can use rhn_register to register.
RHN Satellite or RHN Classic support will be disabled.
rhel-5-server-cf-tools-1-rpms | 3.1 kB 00:00
rhel-5-server-rhev-agent-rpms | 3.1 kB 00:00
rhel-5-server-rpms | 3.7 kB 00:00
rhel-ha-for-rhel-5-server-rpms | 3.7 kB 00:00
rhel-rs-for-rhel-5-server-rpms | 3.7 kB 00:00
rhel-server-dts-5-rpms | 3.1 kB 00:00
rhel-server-dts2-5-rpms | 3.1 kB 00:00
Excluding Packages in global exclude list
Finished
Skipping security plugin, no data
Setting up Update Process
No Packages marked for Update

When I go to rhn_register, I get that the system is already registered.