The udf_encode_fh function in fs/udf/namei.c in the Linux kernel before 3.6 does not initialize a certain structure member, which allows local users to obtain sensitive information from kernel heap memory via a crafted application.
https://www.kernel.org/pub/linux/kernel/v3.x/patch-3.6.bz2
https://github.com/torvalds/linux/commit/0143fc5e9f6f5aad4764801015bc8d4b4a278200
http://www.ubuntu.com/usn/USN-1814-1
http://www.ubuntu.com/usn/USN-1813-1
http://www.ubuntu.com/usn/USN-1812-1
http://www.ubuntu.com/usn/USN-1811-1
http://www.ubuntu.com/usn/USN-1809-1
http://www.ubuntu.com/usn/USN-1808-1
http://www.ubuntu.com/usn/USN-1805-1
http://www.openwall.com/lists/oss-security/2013/03/05/13
http://www.mandriva.com/security/advisories?name=MDVSA-2013:176
http://rhn.redhat.com/errata/RHSA-2013-1051.html
http://lists.opensuse.org/opensuse-security-announce/2013-07/msg00018.html