Please see this and check..
Description
A vulnerability involving the do_mremap system function has been reported in the Linux kernel, allowing for local privilege escalation. Due to a bounds checking issue within the function, it is possible for local attackers to disrupt the operation of the kernel. Attack vectors also exist that may permit a local attacker to gain root privileges.
This type of vulnerability will permit a remote attacker who has gain limited privileges on a host to fully compromise the system.
Please check the following link.. http://securityresponse.symantec.com/avcenter/security/Content/9356.html