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. http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2011-1159
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