The devzvol_readdir function in illumos does not check the return value of a strchr call, which allows remote attackers to cause a denial of service (NULL pointer dereference and panic) via unspecified vectors.
https://www.illumos.org/issues/5421
https://github.com/illumos/illumos-gate/commit/d65686849024838243515b5c40ae2c479460b4b5