acpid.c in acpid before 2.0.9 does not properly handle a situation in which a process has connected to acpid.socket but is not reading any data, which allows local users to cause a denial of service (daemon hang) via a crafted application that performs a connect system call but no read system calls.
lists.fedoraproject.org/pipermail/package-announce/2011-May/059880.html
lists.fedoraproject.org/pipermail/package-announce/2011-May/060053.html
secunia.com/advisories/42947
secunia.com/advisories/44621
www.openwall.com/lists/oss-security/2011/01/19/4
www.openwall.com/lists/oss-security/2011/03/15/12
www.openwall.com/lists/oss-security/2011/03/15/7
www.securityfocus.com/bid/45915
bugzilla.redhat.com/show_bug.cgi?id=688698