The pioctl for the OSD FS command in OpenAFS before 1.6.13 uses the wrong pointer when writing the results of the RPC, which allows local users to cause a denial of service (memory corruption and kernel panic) via a crafted OSD FS command.
https://www.openafs.org/dl/openafs/1.6.13/RELNOTES-1.6.13
https://lists.openafs.org/pipermail/openafs-announce/2015/000486.html
http://www.securitytracker.com/id/1033262
http://www.openafs.org/pages/security/OPENAFS-SA-2015-004.txt