Pluggable Authentication Modules (PAM) is vulnerable to Denial of Service (DoS). The check_acl function in pam_xauth.c in the pam_xauth module in Linux-PAM does not verify that a certain ACL file is a regular file, which might allow local users to cause a denial of service (resource consumption) via a special file.
git.altlinux.org/people/ldv/packages/?p=pam.git;a=commit;h=Linux-PAM-1_1_2-2-gffe7058c70253d574b1963c7c93002bd410fddc9
openwall.com/lists/oss-security/2010/10/03/1
secunia.com/advisories/49711
security.gentoo.org/glsa/glsa-201206-31.xml
www.redhat.com/security/updates/classification/#moderate
www.securityfocus.com/bid/46045
access.redhat.com/errata/RHSA-2010:0819
exchange.xforce.ibmcloud.com/vulnerabilities/65036