MS09-048 includes fixes for TCP/IP implementation issues reporte
More information via
http://www.microsoft.com/technet/security/Bulletin/MS09-048.mspx
and
https://www.cert.fi/haavoittuvuudet/2008/tcp-vulnerabilities.html
Several other vendors have shipped their patches too.
Related CVE is CVE-2008-4609 -
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-4609
Juha-Matti