CVE-2025-67269

Full vulnerability record from the local CVENow database.

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.

Severity

HIGH

CVSS score

7.5 (v3.1)

Vulnerability status

Modified

Source identifier

[email protected]

Published

2026-01-02 16:17:01.100000

Last modified

2026-11-04 22:10:00.210000

View original CVE JSON

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  "id": "CVE-2025-67269",
  "sourceIdentifier": "[email protected]",
  "published": "2026-01-02T16:17:01.100",
  "lastModified": "2026-11-04T22:10:00.210",
  "vulnStatus": "Modified",
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      "value": "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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      "lang": "es",
      "value": "Existe una vulnerabilidad de desbordamiento negativo de enteros en la función “nextstate()” en “gpsd/packet.c” de versiones de gpsd anteriores al commit “ffa1d6f40bca0b035fc7f5e563160ebb67199da7”. Al analizar un paquete NAVCOM, la longitud de la carga útil se calcula usando “lexer  ->  length = (size_t)c - 4” sin verificar si el byte de entrada “c” es menor que 4. Esto resulta en un desbordamiento negativo de enteros sin signo, estableciendo “lexer  ->  length” a un valor muy grande (cercano a “SIZE_MAX”). El analizador entra entonces en un bucle intentando consumir este número masivo de bytes, causando una utilización del 100% de la CPU y una condición de denegación de servicio (DoS)."
    }
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