The MITRE CVE dictionary describes this issue as:
The chain_reply function in process.c in smbd in Samba before 3.4.8 and 3.5.x before 3.5.2 allows remote attackers to cause a denial of service (NULL pointer dereference and process crash) via a Negotiate Protocol request with a certain 0x0003 field value followed by a Session Setup AndX request with a certain 0x8003 field value.
Find out more about CVE-2010-1635 from the
MITRE CVE dictionary dictionary and
Not vulnerable. These issues did not affect the versions of samba as shipped with Red Hat Enterprise Linux 3, 4, or 5.