The afs_linux_lock function in afs/LINUX/osi_vnodeops.c in the kernel module in OpenAFS 1.4.14, 1.4.12, 1.4.7, and possibly other versions does not properly handle errors, which allows attackers to cause a denial of service via unknown vectors. NOTE: some of these details are obtained from third party information.
http://www.vupen.com/english/advisories/2011/0411
http://www.vupen.com/english/advisories/2011/0410
http://www.securitytracker.com/id?1025095
http://www.securityfocus.com/bid/46428
http://www.debian.org/security/2011/dsa-2168