The CRC32C feature in the Btrfs implementation in the Linux kernel before 3.8-rc1 allows local users to cause a denial of service (prevention of file creation) by leveraging the ability to write to a directory important to the victim, and creating a file with a crafted name that is associated with a specific CRC32C hash value.
https://github.com/torvalds/linux/commit/9c52057c698fb96f8f07e7a4bcf4801a092bda89
https://euvd.enisa.europa.eu/vulnerability/EUVD-2012-5294
http://www.ubuntu.com/usn/USN-2017-1
http://www.ubuntu.com/usn/USN-1947-1
http://www.ubuntu.com/usn/USN-1946-1
http://www.ubuntu.com/usn/USN-1945-1
http://www.ubuntu.com/usn/USN-1944-1
http://www.kernel.org/pub/linux/kernel/v3.x/testing/patch-3.8-rc1.bz2