The econet_sendmsg function in net/econet/af_econet.c in the Linux kernel before 2.6.39 on the x86_64 platform allows remote attackers to obtain potentially sensitive information from kernel stack memory by reading uninitialized data in the ah field of an Acorn Universal Networking (AUN) packet.
https://bugzilla.redhat.com/show_bug.cgi?id=591815#c14
http://www.openwall.com/lists/oss-security/2011/03/21/4
http://www.openwall.com/lists/oss-security/2011/03/21/1
http://www.openwall.com/lists/oss-security/2011/03/18/15
http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.39
http://securityreason.com/securityalert/8279