The nr_recvmsg function in net/netrom/af_netrom.c in the Linux kernel before 3.9-rc7 does not initialize a certain data structure, which allows local users to obtain sensitive information from kernel stack memory via a crafted recvmsg or recvfrom system call.
git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=3ce5efad47b62c57a4f5c54248347085a750ce0e
git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=c802d759623acbd6e1ee9fbdabae89159a513913
lists.fedoraproject.org/pipermail/package-announce/2013-April/103750.html
lists.fedoraproject.org/pipermail/package-announce/2013-May/104480.html
lists.opensuse.org/opensuse-security-announce/2013-07/msg00016.html
lists.opensuse.org/opensuse-security-announce/2013-07/msg00018.html
lists.opensuse.org/opensuse-updates/2013-12/msg00129.html
www.mandriva.com/security/advisories?name=MDVSA-2013:176
www.openwall.com/lists/oss-security/2013/04/14/3
github.com/torvalds/linux/commit/3ce5efad47b62c57a4f5c54248347085a750ce0e
github.com/torvalds/linux/commit/c802d759623acbd6e1ee9fbdabae89159a513913
lkml.org/lkml/2013/4/14/107