The proc_do_xprt function in net/sunrpc/sysctl.c in the Linux kernel 2.6.26.3 does not check the length of a certain buffer obtained from userspace, which allows local users to overflow a stack-based buffer and have unspecified other impact via a crafted read system call for the /proc/sys/sunrpc/transports file.
https://exchange.xforce.ibmcloud.com/vulnerabilities/45136
http://www.securityfocus.com/bid/31937
http://www.openwall.com/lists/oss-security/2008/09/04/2
http://lkml.org/lkml/2008/8/30/184
http://lists.opensuse.org/opensuse-security-announce/2008-10/msg00010.html