fkie_cve-2025-38530
Vulnerability from fkie_nvd
Published
2025-08-16 12:15
Modified
2025-08-28 15:15
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: comedi: pcl812: Fix bit shift out of bounds When checking for a supported IRQ number, the following test is used: if ((1 << it->options[1]) & board->irq_bits) { However, `it->options[i]` is an unchecked `int` value from userspace, so the shift amount could be negative or out of bounds. Fix the test by requiring `it->options[1]` to be within bounds before proceeding with the original test. Valid `it->options[1]` values that select the IRQ will be in the range [1,15]. The value 0 explicitly disables the use of interrupts.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0489c30d080f07cc7f09d04de723d8c2ccdb61ef
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/16c173abee315953fd17a279352fec4a1faee862
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/29ef03e5b84431171d6b77b822985b54bc44b793
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/374d9b3eb4b08407997ef1fce96119d31e0c0bc4
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5bfa301e1e59a9b1a7b62a800b54852337c97416
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7e470d8efd10725b189ca8951973a8425932398a
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a27e27eee313fe1c450b6af1e80e64412546cab4
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b14b076ce593f72585412fc7fd3747e03a5e3632
Impacted products
Vendor Product Version


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{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncomedi: pcl812: Fix bit shift out of bounds\n\nWhen checking for a supported IRQ number, the following test is used:\n\n\tif ((1 \u003c\u003c it-\u003eoptions[1]) \u0026 board-\u003eirq_bits) {\n\nHowever, `it-\u003eoptions[i]` is an unchecked `int` value from userspace, so\nthe shift amount could be negative or out of bounds.  Fix the test by\nrequiring `it-\u003eoptions[1]` to be within bounds before proceeding with\nthe original test.  Valid `it-\u003eoptions[1]` values that select the IRQ\nwill be in the range [1,15]. The value 0 explicitly disables the use of\ninterrupts."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: comedi: pcl812: Corregir desplazamiento de bits fuera de los l\u00edmites Al comprobar un n\u00famero de IRQ compatible, se utiliza la siguiente prueba: if ((1 \u0026lt;\u0026lt; it-\u0026gt;options[1]) \u0026amp; board-\u0026gt;irq_bits) { Sin embargo, `it-\u0026gt;options[i]` es un valor `int` no comprobado del espacio de usuario, por lo que la cantidad de desplazamiento podr\u00eda ser negativa o estar fuera de los l\u00edmites. Corrija la prueba exigiendo que `it-\u0026gt;options[1]` est\u00e9 dentro de los l\u00edmites antes de continuar con la prueba original. Los valores v\u00e1lidos de `it-\u0026gt;options[1]` que seleccionan la IRQ estar\u00e1n en el rango [1,15]. El valor 0 deshabilita expl\u00edcitamente el uso de interrupciones."
    }
  ],
  "id": "CVE-2025-38530",
  "lastModified": "2025-08-28T15:15:51.920",
  "metrics": {},
  "published": "2025-08-16T12:15:28.570",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/0489c30d080f07cc7f09d04de723d8c2ccdb61ef"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/16c173abee315953fd17a279352fec4a1faee862"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/29ef03e5b84431171d6b77b822985b54bc44b793"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/374d9b3eb4b08407997ef1fce96119d31e0c0bc4"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/5bfa301e1e59a9b1a7b62a800b54852337c97416"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/7e470d8efd10725b189ca8951973a8425932398a"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/a27e27eee313fe1c450b6af1e80e64412546cab4"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/b14b076ce593f72585412fc7fd3747e03a5e3632"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Awaiting Analysis"
}


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