The do_replace function in net/bridge/netfilter/ebtables.c in the Linux kernel before 2.6.39 does not ensure that a certain name field ends with a '\0' character, which allows local users to obtain potentially sensitive information from kernel stack memory by leveraging the CAP_NET_ADMIN capability to replace a table, and then reading a modprobe command line.
https://github.com/torvalds/linux/commit/d846f71195d57b0bbb143382647c2c6638b04c5a
https://bugzilla.redhat.com/show_bug.cgi?id=681262
http://www.openwall.com/lists/oss-security/2011/03/01/10
http://rhn.redhat.com/errata/RHSA-2011-0833.html
http://ftp.osuosl.org/pub/linux/kernel/v2.6/ChangeLog-2.6.39