Debian 11: gpsd Critical DoS Heap Issue DLA-4441-1 CVE-2025-67268

Multiple vulnerabilities were fixed in gpsd a service daemon that
monitors one or more GNSS (GPS) or AIS receivers attached to a host computer
through serial or USB ports.

CVE-2025-67268

gpsd contains a heap-based out-of-bounds write
vulnerability in the drivers/driver_nmea2000.c file.
The hnd_129540 function, which handles NMEA2000 PGN 129540
(GNSS Satellites in View) packets, fails to validate the
user-supplied satellite count against the size of the skyview
array (184 elements). This allows an attacker to write beyond
the bounds of the array by providing a satellite count up
to 255, leading to memory corruption, Denial of Service (DoS),
and potentially arbitrary code execution.

CVE-2025-67269

An integer underflow vulnerability exists in the `nextstate()`
function in `gpsd/packet.c`.
When parsing a NAVCOM packet, the payload length is calculated
using `lexer->length = (size_t)c - 4` without checking if