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CVE-2024-50196

Estado: ModificadaMedia (5.5)—

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

pinctrl: ocelot: fix system hang on level based interrupts

The current implementation only calls chained_irq_enter() and chained_irq_exit() if it detects pending interrupts.

However, in case of GPIO pin configured in level mode and the parent controller configured in edge mode, GPIO interrupt might be lowered by the hardware. In the result, if the interrupt is short enough, the parent interrupt is still pending while the GPIO interrupt is cleared; chained_irq_enter() never gets called and the system hangs trying to service the parent interrupt.

Leer descripción completaMostrar menos

Moving chained_irq_enter() and chained_irq_exit() outside the for loop ensures that they are called even when GPIO interrupt is lowered by the hardware.

The similar code with chained_irq_enter() / chained_irq_exit() functions wrapping interrupt checking loop may be found in many other drivers: ``` grep -r -A 10 chained_irq_enter drivers/pinctrl ```

Detalles técnicos trazas, registros y código del informe original
```
for (i = 0; i < info->stride; i++) {
	uregmap_read(info->map, id_reg + 4 * i, &reg);
	if (!reg)
		continue;

	chained_irq_enter(parent_chip, desc);
```

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).

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

Referencias

JSON original (NVD)

Mostrar
{
  "id": "CVE-2024-50196",
  "cveTags": [],
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          "role": "CISA Coordinator",
          "options": [
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              "exploitation": "none"
            },
            {
              "automatable": "no"
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              "technicalImpact": "partial"
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          "version": "2.0.3",
          "timestamp": "2025-10-01T20:17:59.256112Z"
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          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "NONE"
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  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\npinctrl: ocelot: fix system hang on level based interrupts\n\nThe current implementation only calls chained_irq_enter() and\nchained_irq_exit() if it detects pending interrupts.\n\n```\nfor (i = 0; i < info->stride; i++) {\n\turegmap_read(info->map, id_reg + 4 * i, &reg);\n\tif (!reg)\n\t\tcontinue;\n\n\tchained_irq_enter(parent_chip, desc);\n```\n\nHowever, in case of GPIO pin configured in level mode and the parent\ncontroller configured in edge mode, GPIO interrupt might be lowered by the\nhardware. In the result, if the interrupt is short enough, the parent\ninterrupt is still pending while the GPIO interrupt is cleared;\nchained_irq_enter() never gets called and the system hangs trying to\nservice the parent interrupt.\n\nMoving chained_irq_enter() and chained_irq_exit() outside the for loop\nensures that they are called even when GPIO interrupt is lowered by the\nhardware.\n\nThe similar code with chained_irq_enter() / chained_irq_exit() functions\nwrapping interrupt checking loop may be found in many other drivers:\n```\ngrep -r -A 10 chained_irq_enter drivers/pinctrl\n```"
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: pinctrl: ocelot: arregla el bloqueo del sistema en interrupciones basadas en niveles La implementación actual solo llama a chained_irq_enter() y chained_irq_exit() si detecta interrupciones pendientes. ``` for (i = 0; i &lt; info-&gt;stride; i++) { uregmap_read(info-&gt;map, id_reg + 4 * i, ®); if (!reg) continue; chained_irq_enter(parent_chip, desc); ``` Sin embargo, en el caso de que el pin GPIO esté configurado en modo de nivel y el controlador principal esté configurado en modo de borde, el hardware puede reducir la interrupción GPIO. Como resultado, si la interrupción es lo suficientemente corta, la interrupción principal sigue pendiente mientras se borra la interrupción GPIO; chained_irq_enter() nunca se llama y el sistema se cuelga al intentar dar servicio a la interrupción principal. Mover chained_irq_enter() y chained_irq_exit() fuera del bucle for garantiza que se llamen incluso cuando el hardware reduce la interrupción GPIO. El código similar con las funciones chained_irq_enter() / chained_irq_exit() que envuelven el bucle de verificación de interrupciones se puede encontrar en muchos otros controladores: ``` grep -r -A 10 chained_irq_enter drivers/pinctrl ```"
    }
  ],
  "lastModified": "2026-06-17T08:03:50.810",
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