net/packet/af_packet.c in the Linux kernel before 2.6.37-rc2 does not properly initialize certain structure members, which allows local users to obtain potentially sensitive information from kernel stack memory by leveraging the CAP_NET_RAW capability to read copies of the applicable structures.
https://bugzilla.redhat.com/show_bug.cgi?id=649715
http://www.vupen.com/english/advisories/2011/0168
http://www.vupen.com/english/advisories/2011/0024
http://www.vmware.com/security/advisories/VMSA-2011-0012.html
http://www.securityfocus.com/bid/44630
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-2011-0007.html
http://www.redhat.com/support/errata/RHSA-2011-0004.html
http://www.redhat.com/support/errata/RHSA-2010-0958.html
http://www.debian.org/security/2010/dsa-2126
http://secunia.com/advisories/46397
http://secunia.com/advisories/42963
http://secunia.com/advisories/42890
http://secunia.com/advisories/42789
http://openwall.com/lists/oss-security/2010/11/04/5
http://openwall.com/lists/oss-security/2010/11/02/9
http://openwall.com/lists/oss-security/2010/11/02/7
http://openwall.com/lists/oss-security/2010/11/02/12
http://openwall.com/lists/oss-security/2010/11/02/10