The do_fork function in Linux 2.4.x before 2.4.26, and 2.6.x before 2.6.6, does not properly decrement the mm_count counter when an error occurs after the mm_struct for a child process has been activated, which triggers a memory leak that allows local users to cause a denial of service (memory exhaustion) via the clone (CLONE_VM) system call.
https://exchange.xforce.ibmcloud.com/vulnerabilities/16002
http://www.mandriva.com/security/advisories?name=MDKSA-2004:037
http://secunia.com/advisories/20338