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Fencer Vulns
high 7.5

CVE-2025-67269 json

An integer underflow vulnerability exists in the `nextstate()` function in `gpsd/packet.c` of gpsd versions prior to commit `ffa1d6f40bca0b…

published 2026-01-02 10 mo ago modified 2026-11-04 4 d ago also EUVD-2026-0658

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.6%
EPSS 0.6% chance of exploitation in 30 days, percentile 47%
public exploits
0
none known

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.

Patch / fix

  • Red Hat Red Hat Enterprise Linux 10 1:3.26.1-1.el10_1.1
  • Red Hat Red Hat Enterprise Linux 9 1:3.26.1-1.el9_7.1
  • gpsd Debian 12 3.22-4.1+deb12u1
  • gpsd Debian 13 3.25-5+deb13u1
  • gpsd Debian 14 3.27.5-0.1

debian advisories DEBIAN-CVE-2025-67269

  • gpsd Ubuntu 22.04 LTS 3.22-4ubuntu2.1
  • gpsd Ubuntu 24.04 LTS 3.25-3ubuntu3.2
  • gpsd Ubuntu 25.10 3.25-5ubuntu1.25.10.1
  • gpsd Ubuntu 26.04 LTS 3.27-1.1ubuntu1

ubuntu advisories UBUNTU-CVE-2025-67269

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • gpsd RHEL 10.1 1:3.26.1-1.el10_1.1
  • gpsd-clients RHEL 10.1 1:3.26.1-1.el10_1.1
  • python3-gpsd RHEL 10.1 1:3.26.1-1.el10_1.1
  • gpsd-minimal RHEL 9 1:3.26.1-1.el9_7.1
  • gpsd-minimal-clients RHEL 9 1:3.26.1-1.el9_7.1

red hat advisories RHSA-2026:0770RHSA-2026:0771

  • gpsd openSUSE Tumbleweed 3.27.3-1.1

opensuse advisories openSUSE-SU-2026:10008-1

  • gpsd AlmaLinux 10 1:3.26.1-1.el10_1.1
  • gpsd-clients AlmaLinux 10 1:3.26.1-1.el10_1.1
  • python3-gpsd AlmaLinux 10 1:3.26.1-1.el10_1.1
  • gpsd-minimal AlmaLinux 9 1:3.26.1-1.el9_7.1
  • gpsd-minimal-clients AlmaLinux 9 1:3.26.1-1.el9_7.1

almalinux advisories ALSA-2026:0770ALSA-2026:0771

  • gpsd Rocky Linux 10 1:3.26.1-1.el10_1.1
  • gpsd-minimal Rocky Linux 9 1:3.26.1-1.el9_7.1

rocky linux advisories RLSA-2026:0770RLSA-2026:0771

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2025-67269 updated cvss 7.5

gpsd: gpsd: Denial of Service due to malformed NAVCOM packet parsing

  • Red Hat Enterprise Linux AppStream (v. 9) gpsd-minimal 3.26.1-1.el9_7.1, gpsd-minimal-clients 3.26.1-1.el9_7.1
    fixed: vendor fix RHSA-2026:0771
  • Red Hat Enterprise Linux AppStream (v. 10) gpsd 3.26.1-1.el10_1.1, gpsd-clients 3.26.1-1.el10_1.1, python3-gpsd 3.26.1-1.el10_1.1
    fixed: vendor fix RHSA-2026:0770

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
10 mo ago

Exploit prediction

0.56% chance of exploitation in the next 30 days, higher than 47% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/Jaenact/gspd_cve/blob/main/CVE-2025-67269/README.md referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CISA ADP 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

  • Red Hat Red Hat Enterprise Linux 10
  • Red Hat Red Hat Enterprise Linux 9

Classification

Weakness
  • CWE-191 Integer Underflow (Wrap or Wraparound)

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.