From https://secunia.com/advisories/50310/ :
A vulnerability has been reported in Linux Kernel, which can be exploited by malicious, local users
to cause a DoS (Denial of Service).
The vulnerability is caused due to a use-after-free error in the "madvise_remove()" function and
can be exploited to dereference already freed memory.
Update to version 3.0.37, 3.2.23, 3.4.5, or apply fix in the GIT repository for version 2.6.x.
Provided and/or discovered by
There are no longer any 2.x or <3.4.5 kernels available in the repository with the exception of sys-kernel/xbox-sources which is unsupported by security.