The (1) agp_generic_alloc_page and (2) agp_generic_alloc_pages functions in drivers/char/agp/generic.c in the agp subsystem in the Linux kernel before 2.6.30-rc3 do not zero out pages that may later be available to a user-space process, which allows local users to obtain sensitive information by reading these pages.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A8003
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10567
https://bugzilla.redhat.com/show_bug.cgi?id=497020
http://www.vupen.com/english/advisories/2009/3316
http://www.vmware.com/security/advisories/VMSA-2009-0016.html
http://www.ubuntu.com/usn/usn-793-1
http://www.securityfocus.com/bid/34673
http://www.securityfocus.com/archive/1/507985/100/0/threaded
http://www.securityfocus.com/archive/1/503610/100/0/threaded
http://www.redhat.com/support/errata/RHSA-2009-1081.html
http://www.mandriva.com/security/advisories?name=MDVSA-2009:135
http://www.mandriva.com/security/advisories?name=MDVSA-2009:119
http://www.kernel.org/pub/linux/kernel/v2.6/testing/ChangeLog-2.6.30-rc3
http://www.debian.org/security/2009/dsa-1800
http://www.debian.org/security/2009/dsa-1794
http://www.debian.org/security/2009/dsa-1787
http://wiki.rpath.com/Advisories:rPSA-2009-0084
http://secunia.com/advisories/37471
http://secunia.com/advisories/37351
http://secunia.com/advisories/35656
http://secunia.com/advisories/35387
http://secunia.com/advisories/35343
http://secunia.com/advisories/35121
http://secunia.com/advisories/35120
http://secunia.com/advisories/35011
http://secunia.com/advisories/34981
http://openwall.com/lists/oss-security/2009/04/22/2
http://lists.opensuse.org/opensuse-security-announce/2009-11/msg00007.html
http://lists.opensuse.org/opensuse-security-announce/2009-11/msg00005.html
http://lists.opensuse.org/opensuse-security-announce/2009-06/msg00002.html