The Windows kernel is the core of the operating system. It provides system level services such as device and memory management, allocates processor time to processes and manages error handling.

There is a flaw in the way the kernel passes error messages to a debugger. A vulnerability results because an attacker could write a program to exploit this flaw and run code of their choice. An attacker could exploit this vulnerability to take any action on the system including deleting data, adding accounts with administrative access, or reconfiguring the system.

For more information and patch availability, go to Microsoft Security Bulletin MS03-013