Use-after-free vulnerability in the Linux kernel before 3.3.6, when huge pages are enabled, allows local users to cause a denial of service (system crash) or possibly gain privileges by interacting with a hugetlbfs filesystem, as demonstrated by a umount operation that triggers improper handling of quota data.
http://lists.opensuse.org/opensuse-security-announce/2012-05/msg00013.html
https://bugzilla.redhat.com/show_bug.cgi?id=817430
https://exchange.xforce.ibmcloud.com/vulnerabilities/75168
https://github.com/torvalds/linux/commit/90481622d75715bfcb68501280a917dbfe516029
http://www.debian.org/security/2012/dsa-2469