The poll_mode_io file for the megaraid_sas driver in the Linux kernel 2.6.31.6 and earlier has world-writable permissions, which allows local users to change the I/O mode of the driver by modifying this file.
http://lists.opensuse.org/opensuse-security-announce/2009-12/msg00002.html
http://lists.opensuse.org/opensuse-security-announce/2009-12/msg00005.html
http://lists.opensuse.org/opensuse-security-announce/2010-01/msg00000.html
http://lists.opensuse.org/opensuse-security-announce/2010-01/msg00005.html
http://lists.opensuse.org/opensuse-security-announce/2010-02/msg00002.html
http://lists.opensuse.org/opensuse-security-announce/2010-02/msg00005.html
http://lists.opensuse.org/opensuse-security-announce/2010-03/msg00000.html
https://bugzilla.redhat.com/show_bug.cgi?id=526068
https://rhn.redhat.com/errata/RHSA-2010-0046.html
https://rhn.redhat.com/errata/RHSA-2010-0095.html
http://support.avaya.com/css/P8/documents/100073666
http://www.debian.org/security/2010/dsa-1996