Sendmail before 8.11.4, and 8.12.0 before 8.12.0.Beta10, allows local users to cause a denial of service and possibly corrupt the heap and gain privileges via race conditions in signal handlers.
https://github.com/NSzolnoki/CVEPoisonKnowledgebase
https://euvd.enisa.europa.eu/vulnerability/EUVD-2001-1330
http://www.securityfocus.com/bid/2794
http://www.securityfocus.com/archive/1/187127
http://www.iss.net/security_center/static/6633.php
http://rhn.redhat.com/errata/RHSA-2001-106.html
http://razor.bindview.com/publish/advisories/adv_sm8120.html
http://archives.neohapsis.com/archives/sendmail/2001-q2/0001.html