The cxgb_extension_ioctl function in drivers/net/cxgb3/cxgb3_main.c in the Linux kernel before 2.6.36-rc5 does not properly initialize a certain structure member, which allows local users to obtain potentially sensitive information from kernel stack memory via a CHELSIO_GET_QSET_NUM ioctl call.
https://bugzilla.redhat.com/show_bug.cgi?id=633149
http://www.vupen.com/english/advisories/2011/0298
http://www.vupen.com/english/advisories/2011/0070
http://www.vmware.com/security/advisories/VMSA-2011-0012.html
http://www.ubuntu.com/usn/USN-1041-1
http://www.securityfocus.com/bid/43221
http://www.securityfocus.com/archive/1/520102/100/0/threaded
http://www.redhat.com/support/errata/RHSA-2011-0017.html
http://www.openwall.com/lists/oss-security/2010/09/14/7
http://www.openwall.com/lists/oss-security/2010/09/14/2
http://www.debian.org/security/2010/dsa-2126
http://secunia.com/advisories/46397
http://secunia.com/advisories/42884
http://secunia.com/advisories/42758
http://secunia.com/advisories/41440
http://lkml.org/lkml/2010/9/11/170
http://lists.opensuse.org/opensuse-security-announce/2011-02/msg00000.html
http://lists.opensuse.org/opensuse-security-announce/2010-11/msg00000.html
http://lists.opensuse.org/opensuse-security-announce/2010-10/msg00003.html