FreeBSD 8.4 before p14, 9.1 before p17, 9.2 before p10, and 10.0 before p7 does not properly initialize the buffer between the header and data of a control message, which allows local users to obtain sensitive information from kernel memory via unspecified vectors.
Improper Restriction of Operations within the Bounds of a Memory Buffer The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary.