The NMEA0183 driver in gpsd before 3.9 allows remote attackers to cause a denial of service (daemon termination) and possibly execute arbitrary code via a GPS packet with a malformed $GPGGA interpreted sentence that lacks certain fields and a terminator. NOTE: a separate issue in the AIS driver was also reported, but it might not be a vulnerability.
http://ubuntu.com/usn/usn-1820-1
http://openwall.com/lists/oss-security/2013/05/08/1
http://openwall.com/lists/oss-security/2013/05/02/20
http://lists.nongnu.org/archive/html/gpsd-dev/2013-05/msg00000.html