When constructing an Rx acknowledgment (ACK) packet, Andrew-derived Rx
implementations do not initialize three octets of data that are padding
in the C language structure and were inadvertently included in the wire
protocol (CVE-2015-7762). Additionally, OpenAFS Rx in versions 1.5.75
through 1.5.78, 1.6.0 through 1.6.14, and 1.7.0 through 1.7.32 include
a variable-length padding at the end of the ACK packet, in an attempt to
detect the path MTU, but only four octets of the additional padding are
initialized (CVE-2015-7763).