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=========================================================== Ubuntu Security Notice USN-766-1 April 27, 2009 acpid vulnerability CVE-2009-0798 =========================================================== A security issue affects the following Ubuntu releases: Ubuntu 6.06 LTS Ubuntu 8.04 LTS Ubuntu 8.10 Ubuntu 9.04 This advisory also applies to the corresponding versions of Kubuntu, Edubuntu, and Xubuntu. The problem can be corrected by upgrading your system to the following package versions: Ubuntu 6.06 LTS: acpid 1.0.4-1ubuntu11.2 Ubuntu 8.04 LTS: acpid 1.0.4-5ubuntu9.3 Ubuntu 8.10: acpid 1.0.6-9ubuntu4.8.10.2 Ubuntu 9.04: acpid 1.0.6-9ubuntu4.9.04.2 In general, a standard system upgrade is sufficient to effect the necessary changes. Details follow: It was discovered that acpid did not properly handle a large number of connections. A local user could exploit this and monopolize CPU resources, leading to a denial of service.