CVE-2025-67269

Name	CVE-2025-67269
Description	An integer underflow vulnerability exists in the `nextstate()` function in `gpsd/packet.c` of gpsd versions prior to commit `ffa1d6f40bca0b035fc7f5e563160ebb67199da7`. When parsing a NAVCOM packet, the payload length is calculated using `lexer->length = (size_t)c - 4` without checking if the input byte `c` is less than 4. This results in an unsigned integer underflow, setting `lexer->length` to a very large value (near `SIZE_MAX`). The parser then enters a loop attempting to consume this massive number of bytes, causing 100% CPU utilization and a Denial of Service (DoS) condition.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
Debian Bugs	1124799

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
gpsd (PTS)	bullseye	3.22-4	vulnerable
	bookworm	3.22-4.1	vulnerable
	trixie	3.25-5	vulnerable
	forky, sid	3.27-1.1	vulnerable

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
gpsd	source	(unstable)	(unfixed)			1124799

Notes

[trixie] - gpsd <no-dsa> (Minor issue)
[bookworm] - gpsd <no-dsa> (Minor issue)
https://github.com/Jaenact/gspd_cve/blob/main/CVE-2025-67269/README.md
Fixed by: https://gitlab.com/gpsd/gpsd/-/commit/ffa1d6f40bca0b035fc7f5e563160ebb67199da7 (release-3.27.1)