ghsa-xcj3-m9c5-2prq
Vulnerability from github
Published
2026-01-02 18:30
Modified
2026-01-02 18:30
Details

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.

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{
  "affected": [],
  "aliases": [
    "CVE-2025-67269"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-01-02T16:17:01Z",
    "severity": null
  },
  "details": "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-\u003elength = (size_t)c - 4` without checking if the input byte `c` is less than 4. This results in an unsigned integer underflow, setting `lexer-\u003elength` 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.",
  "id": "GHSA-xcj3-m9c5-2prq",
  "modified": "2026-01-02T18:30:31Z",
  "published": "2026-01-02T18:30:31Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-67269"
    },
    {
      "type": "WEB",
      "url": "https://github.com/Jaenact/gspd_cve/blob/main/CVE-2025-67269/README.md"
    },
    {
      "type": "WEB",
      "url": "https://gitlab.com/gpsd/gpsd"
    },
    {
      "type": "WEB",
      "url": "https://gitlab.com/gpsd/gpsd/-/commit/ffa1d6f40bca0b035fc7f5e563160ebb67199da7"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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