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CVE-2025-38183

Estado: AnalizadaAlta (7.8)—

In the Linux kernel, the following vulnerability has been resolved:

net: lan743x: fix potential out-of-bounds write in lan743x_ptp_io_event_clock_get()

Before calling lan743x_ptp_io_event_clock_get(), the 'channel' value is checked against the maximum value of PCI11X1X_PTP_IO_MAX_CHANNELS(8). This seems correct and aligns with the PTP interrupt status register (PTP_INT_STS) specifications.

However, lan743x_ptp_io_event_clock_get() writes to ptp->extts[] with only LAN743X_PTP_N_EXTTS(4) elements, using channel as an index:

To avoid an out-of-bounds write and utilize all the supported GPIO inputs, set LAN743X_PTP_N_EXTTS to 8.

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Detected using the static analysis tool - Svace.

Detalles técnicos trazas, registros y código del informe original
    lan743x_ptp_io_event_clock_get(..., u8 channel,...)
    {
        ...
        /* Update Local timestamp */
        extts = &ptp->extts[channel];
        extts->ts.tv_sec = sec;
        ...
    }

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

Acceso local con privilegios (PR:L) sin interacción permite explotar buffer overflow (CWE-787) para escalada; escritura fuera de límites en kernel produce ejecución de código.

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Execution PreventionThreat Intelligence ProgramRestrict Web-Based ContentPrivileged Account ManagementLimit Software InstallationBehavior Prevention on Endpoint

Tecnologías afectadas (2)

Debian — Debian LinuxLinux — Linux Kernel

CWE

Referencias

JSON original (NVD)

Mostrar
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  "id": "CVE-2025-38183",
  "cveTags": [],
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        "source": "nvd@nist.gov",
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          "version": "3.1",
          "baseScore": 7.8,
          "attackVector": "LOCAL",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "HIGH"
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      "source": "nvd@nist.gov",
      "description": [
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          "value": "CWE-787"
        }
      ]
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  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: lan743x: fix potential out-of-bounds write in lan743x_ptp_io_event_clock_get()\n\nBefore calling lan743x_ptp_io_event_clock_get(), the 'channel' value\nis checked against the maximum value of PCI11X1X_PTP_IO_MAX_CHANNELS(8).\nThis seems correct and aligns with the PTP interrupt status register\n(PTP_INT_STS) specifications.\n\nHowever, lan743x_ptp_io_event_clock_get() writes to ptp->extts[] with\nonly LAN743X_PTP_N_EXTTS(4) elements, using channel as an index:\n\n    lan743x_ptp_io_event_clock_get(..., u8 channel,...)\n    {\n        ...\n        /* Update Local timestamp */\n        extts = &ptp->extts[channel];\n        extts->ts.tv_sec = sec;\n        ...\n    }\n\nTo avoid an out-of-bounds write and utilize all the supported GPIO\ninputs, set LAN743X_PTP_N_EXTTS to 8.\n\nDetected using the static analysis tool - Svace."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net: lan743x: corrección de una posible escritura fuera de los límites en lan743x_ptp_io_event_clock_get(). Antes de llamar a lan743x_ptp_io_event_clock_get(), el valor del canal se compara con el valor máximo de PCI11X1X_PTP_IO_MAX_CHANNELS(8). Esto parece correcto y se ajusta a las especificaciones del registro de estado de interrupción PTP (PTP_INT_STS). Sin embargo, lan743x_ptp_io_event_clock_get() escribe en ptp->extts[] solo con elementos LAN743X_PTP_N_EXTTS(4), usando el canal como índice: lan743x_ptp_io_event_clock_get(..., u8 channel,...) { ... /* Actualizar marca de tiempo local */ extts = &ptp->extts[channel]; extts->ts.tv_sec = sec; ... } Para evitar una escritura fuera de los límites y utilizar todas las entradas GPIO compatibles, configure LAN743X_PTP_N_EXTTS en 8. Detectado usando la herramienta de análisis estático - Svace."
    }
  ],
  "lastModified": "2026-06-17T09:16:20.467",
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