Off-by-one error in afs_pioctl.c in OpenAFS before 1.6.16 might allow local users to cause a denial of service (memory overwrite and system crash) via a pioctl with an input buffer size of 4096 bytes.
https://www.openafs.org/dl/1.6.16/RELNOTES-1.6.16
http://www.debian.org/security/2016/dsa-3569
http://git.openafs.org/?p=openafs.git%3Ba=commitdiff%3Bh=2ef863720da4d9f368aaca0461c672a3008195ca