arch/x86/include/asm/pgtable.h in the Linux kernel before 3.6.2, when transparent huge pages are used, does not properly support PROT_NONE memory regions, which allows local users to cause a denial of service (system crash) via a crafted application.
git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=027ef6c87853b0a9df53175063028edb4950d476
rhn.redhat.com/errata/RHSA-2013-0496.html
www.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.6.2
www.openwall.com/lists/oss-security/2013/02/20/4
bugzilla.redhat.com/show_bug.cgi?id=912898
github.com/torvalds/linux/commit/027ef6c87853b0a9df53175063028edb4950d476