The encode_share_access function in fs/nfs/nfs4xdr.c in the Linux kernel before 2.6.29 allows local users to cause a denial of service (BUG and system crash) by using the mknod system call with a pathname on an NFSv4 filesystem.
https://bugzilla.redhat.com/show_bug.cgi?id=755440
http://www.openwall.com/lists/oss-security/2012/02/06/3
http://ftp.osuosl.org/pub/linux/kernel/v2.6/ChangeLog-2.6.29