Integer overflow in the vma_to_resize function in mm/mremap.c in the Linux kernel before 2.6.39 allows local users to cause a denial of service (BUG_ON and system crash) via a crafted mremap system call that expands a memory mapping.
https://bugzilla.redhat.com/show_bug.cgi?id=716538
http://www.openwall.com/lists/oss-security/2011/06/27/2
http://ftp.osuosl.org/pub/linux/kernel/v2.6/ChangeLog-2.6.39