The (1) setfacl and (2) getfacl commands in XFS acl 2.2.47, when running in recursive (-R) mode, follow symbolic links even when the --physical (aka -P) or -L option is specified, which might allow local users to modify the ACL for arbitrary files or directories via a symlink attack.
https://exchange.xforce.ibmcloud.com/vulnerabilities/55004
http://www.securityfocus.com/bid/37455
http://www.openwall.com/lists/oss-security/2009/12/23/2
http://www.mandriva.com/security/advisories?name=MDVSA-2009:345
http://secunia.com/advisories/38420
http://secunia.com/advisories/37907
http://oss.sgi.com/bugzilla/show_bug.cgi?id=790
http://lists.opensuse.org/opensuse-security-announce/2010-02/msg00000.html