CVE-2025-67269
GPSD Integer Underflow Vulnerability
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.
INFO
Published Date :
Jan. 2, 2026, 4:17 p.m.
Last Modified :
Jan. 9, 2026, 10:07 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | 134c704f-9b21-4f2e-91b3-4a467353bcc0 |
Solution
- Ensure input 'c' is greater than 4 before calculation.
- Update gpsd to version with fix commit ffa1d6f40bca0b035fc7f5e563160ebb67199da7.
- Restart the gpsd service after applying the update.
Public PoC/Exploit Available at Github
CVE-2025-67269 has a 3 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2025-67269.
| URL | Resource |
|---|---|
| https://github.com/Jaenact/gspd_cve/blob/main/CVE-2025-67269/README.md | Exploit Third Party Advisory |
| https://gitlab.com/gpsd/gpsd | Product |
| https://gitlab.com/gpsd/gpsd/-/commit/ffa1d6f40bca0b035fc7f5e563160ebb67199da7 | Patch |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2025-67269 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2025-67269
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
None
None
Community reconstruction of the legacy JSON NVD Data Feeds. This project uses and redistributes data from the NVD API but is neither endorsed nor certified by the NVD.
Shell
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2025-67269 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2025-67269 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Jan. 09, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:gpsd_project:gpsd:*:*:*:*:*:*:*:* versions up to (excluding) 3.27.1 Added Reference Type MITRE: https://github.com/Jaenact/gspd_cve/blob/main/CVE-2025-67269/README.md Types: Exploit, Third Party Advisory Added Reference Type MITRE: https://gitlab.com/gpsd/gpsd Types: Product Added Reference Type MITRE: https://gitlab.com/gpsd/gpsd/-/commit/ffa1d6f40bca0b035fc7f5e563160ebb67199da7 Types: Patch -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jan. 06, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Added CWE CWE-191 -
New CVE Received by [email protected]
Jan. 02, 2026
Action Type Old Value New Value Added 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. Added Reference https://github.com/Jaenact/gspd_cve/blob/main/CVE-2025-67269/README.md Added Reference https://gitlab.com/gpsd/gpsd Added Reference https://gitlab.com/gpsd/gpsd/-/commit/ffa1d6f40bca0b035fc7f5e563160ebb67199da7