Improper Control of Generation of Code ('Code Injection')
The do_anonymous_page function in mm/memory.c in the Linux kernel before 126.96.36.199, 2.6.32.x before 188.8.131.52, 2.6.34.x before 184.108.40.206, and 2.6.35.x before 220.127.116.11 does not properly separate the stack and the heap, which allows context-dependent attackers to execute arbitrary code by writing to the bottom page of a shared memory segment, as demonstrated by a memory-exhaustion attack against the X.Org X server.
CWE-94 - Code Injection
Code injection is a type of vulnerability that allows an attacker to execute arbitrary code. This vulnerability fully compromises the machine and can cause a wide variety of security issues, such as unauthorized access to sensitive information, manipulation of data, denial of service attacks etc. Code injection is different from command injection in the fact that it is limited by the functionality of the injected language (e.g. PHP), as opposed to command injection, which leverages existing code to execute commands, usually within the context of a shell.