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Execute Disable Bit
Last modified: Wednesday, May 11, 2005 

Intel's Execute Disable Bit  (XD) functionality can prevent certain classes of malicious buffer overflow attacks when combined with a supporting operating system. It allows the processor to classify areas in memory by where application code can execute and where it cannot. When a malicious worm attempts to insert code in the buffer, the processor disables code execution, preventing damage or worm propagation.

Intel's Execute Disable Bit functionality was first released for the Intel Itanium processor family in 2001.

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Execute Disable Bit Technology 
This Intel Business Security Web page discusses processors that combat "Buffer Overflow" attacks.

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