Oracle Announces The Same Enterprise Class Support For Linux As For Its Database http://www.oracle.com/corporate/press/2006_oct/Oracle-Linux-Program.html
"This announcement is provided to you solely for information purposes, is not a commitment to deliver any material, code, or functionality, and should not be relied upon in making purchasing decisions. Many factors can materially affect Oracle's product development plans and the nature and timing of future product releases. The development, release, and timing of any features or functionality described remains at the sole discretion of Oracle. This information may not be incorporated into any contractual agreement with Oracle or its subsidiaries or affiliates. Oracle specifically disclaims any liability with respect to this information."
"Oracle starts with Red Hat Linux, removes Red Hat trademarks, and then adds Linux bug fixes."
Sounds like Mandrake Linux 5.2.