arch/x86_64/lib/copy_user.S in the Linux kernel before 2.6.19 on some AMD64 systems does not erase destination memory locations after an exception during kernel memory copy, which allows local users to obtain sensitive information.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A11571
https://exchange.xforce.ibmcloud.com/vulnerabilities/43558
https://bugzilla.redhat.com/show_bug.cgi?id=451271
http://www.ubuntu.com/usn/usn-625-1
http://www.securitytracker.com/id?1020364
http://www.securityfocus.com/bid/29943
http://www.debian.org/security/2008/dsa-1630