The __nfs4_get_acl_uncached function in fs/nfs/nfs4proc.c in the NFSv4 implementation in the Linux kernel before 3.3.2 uses an incorrect length variable during a copy operation, which allows remote NFS servers to cause a denial of service (OOPS) by sending an excessive number of bitmap words in an FATTR4_ACL reply. NOTE: this vulnerability exists because of an incomplete fix for CVE-2011-4131.
https://bugzilla.redhat.com/show_bug.cgi?id=822869
http://www.openwall.com/lists/oss-security/2012/05/18/13
http://www.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.3.2
http://rhn.redhat.com/errata/RHSA-2012-1580.html