View at Official ubuntu advisory, NVD, CVE.org · CVE detail
Freshness: upstream tracker timestamp is available; use API updated time as primary recency signal.
CVE-2011-3149 medium priority: Ubuntu including 1 source packages (pam), 6 status rows across 6 suites (hardy, lucid, maverick, natty, oneiric, upstream): released 5, needs-triage 1.
The _expand_arg function in the pam_env module (modules/pam_env/pam_env.c) in Linux-PAM (aka pam) before 1.1.5 does not properly handle when environment variable expansion can overflow, which allows local users to cause a denial of service (CPU consumption).