An integer underflow vulnerability exists in the `nextstate()` function in…
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA and Red Hat. Impact type from CWE-191 and the CVSS impact.
Summary
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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:gpsd_project:gpsd:*:*:*:*:*:*:*:* | before 3.27.1 | Vulnerable | Gpsd Project |
- cpe:2.3:a:gpsd_project:gpsd:*:*:*:*:*:*:*:* Versions before 3.27.1 Vulnerable ·Gpsd Project
Remediation
Red Hat 2 advisories
- RHSA-2026:0771 Released 2026-01-19 · Red Hat rating Importantgpsd-minimal security update
- Red Hat Enterprise Linux AppStream (v. 9) gpsd-minimal-1:3.26.1-1.el9_7.1, gpsd-minimal-clients-1:3.26.1-1.el9_7.1
- RHSA-2026:0770 Released 2026-01-19 · Red Hat rating Importantgpsd security update
- Red Hat Enterprise Linux AppStream (v. 10) gpsd-1:3.26.1-1.el10_1.1, gpsd-clients-1:3.26.1-1.el10_1.1, python3-gpsd-1:3.26.1-1.el10_1.1
Vendor assessments
Red Hat
Red Hat rating: Important. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux AppStream (v. 10) | Fixed | RHSA-2026:0770 |
| Red Hat Enterprise Linux AppStream (v. 9) | Fixed | RHSA-2026:0771 |
Timeline
- 2026-10-02 Threatist record created from CVE-2025-67269
- 2026-10-03 Alias added: GHSA-xcj3-m9c5-2prq
References
More Gpsd Project Gpsd vulnerabilities
- TI-2025-41174 gpsd before commit dc966aa contains a heap-based out-of-bounds write vulnerability in the… CVSS 3.1CRITICAL 9.8
- TI-2026-42067 gpsd gpsprof Command Injection via gnuplot plot title subtype field CVSS 4.0HIGH 8.4
- TI-2018-12768 Stack-based buffer overflow in ICS-CERT gpsd and microjson CVSS 3.1HIGH 8.8
- TI-2023-23356 Integer underflow in GPSd CVSS 3.1HIGH 7.5
- TI-2013-01809 The NMEA0183 driver in gpsd before 3.9 allows remote attackers to cause a denial of… CVSS 2.0MEDIUM 4.3
Sources
- CVE-2025-67269 · CVE Program
- CVE-2025-67269 · NVD
- FIRST EPSS
- GHSA-xcj3-m9c5-2prq · GitHub Advisory Database · CC BY 4.0
- CVE-2025-67269 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences