The sk_run_filter function in net/core/filter.c in the Linux kernel before 2.6.36.2 does not check whether a certain memory location has been initialized before executing a (1) BPF_S_LD_MEM or (2) BPF_S_LDX_MEM instruction, which allows local users to obtain potentially sensitive information from kernel stack memory via a crafted socket filter.
https://bugzilla.redhat.com/show_bug.cgi?id=651698
http://www.vupen.com/english/advisories/2011/0375
http://www.vupen.com/english/advisories/2011/0298
http://www.vupen.com/english/advisories/2011/0168
http://www.vupen.com/english/advisories/2011/0124
http://www.vupen.com/english/advisories/2011/0012
http://www.vupen.com/english/advisories/2010/3321
http://www.vmware.com/security/advisories/VMSA-2011-0012.html
http://www.spinics.net/lists/netdev/msg146361.html
http://www.securityfocus.com/bid/44758
http://www.securityfocus.com/archive/1/520102/100/0/threaded
http://www.redhat.com/support/errata/RHSA-2011-0162.html
http://www.redhat.com/support/errata/RHSA-2011-0017.html
http://www.redhat.com/support/errata/RHSA-2011-0007.html
http://www.redhat.com/support/errata/RHSA-2010-0958.html
http://www.mandriva.com/security/advisories?name=MDVSA-2011:029
http://secunia.com/advisories/46397
http://secunia.com/advisories/43291
http://secunia.com/advisories/42963
http://secunia.com/advisories/42932
http://secunia.com/advisories/42890
http://secunia.com/advisories/42884
http://secunia.com/advisories/42801
http://secunia.com/advisories/42778
http://secunia.com/advisories/42745
http://lists.opensuse.org/opensuse-security-announce/2011-02/msg00002.html
http://lists.opensuse.org/opensuse-security-announce/2011-02/msg00000.html
http://lists.opensuse.org/opensuse-security-announce/2011-01/msg00004.html
http://lists.opensuse.org/opensuse-security-announce/2011-01/msg00001.html
http://lists.opensuse.org/opensuse-security-announce/2011-01/msg00000.html
http://lists.opensuse.org/opensuse-security-announce/2010-12/msg00004.html
http://lists.grok.org.uk/pipermail/full-disclosure/2010-November/077321.html
http://lists.fedoraproject.org/pipermail/package-announce/2010-December/052513.html