FKIE_CVE-2025-38481

Vulnerability from fkie_nvd - Published: 2025-07-28 12:15 - Updated: 2025-11-03 18:16
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: comedi: Fail COMEDI_INSNLIST ioctl if n_insns is too large The handling of the `COMEDI_INSNLIST` ioctl allocates a kernel buffer to hold the array of `struct comedi_insn`, getting the length from the `n_insns` member of the `struct comedi_insnlist` supplied by the user. The allocation will fail with a WARNING and a stack dump if it is too large. Avoid that by failing with an `-EINVAL` error if the supplied `n_insns` value is unreasonable. Define the limit on the `n_insns` value in the `MAX_INSNS` macro. Set this to the same value as `MAX_SAMPLES` (65536), which is the maximum allowed sum of the values of the member `n` in the array of `struct comedi_insn`, and sensible comedi instructions will have an `n` of at least 1.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/08ae4b20f5e82101d77326ecab9089e110f224cc
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/454d732dfd0aef7d7aa950c409215ca06d717e93
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/69dc06b9514522de532e997a21d035cd29b0db44
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/992d600f284e719242a434166e86c1999649b71c
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c68257588e87f45530235701a42496b7e9e56adb
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c9d3d9667443caafa804cd07940aeaef8e53aa90
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d4c73ce13f5b5a0fe0319f1f352ff602f0ace8e3
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e3b8322cc8081d142ee4c1a43e1d702bdba1ed76
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html
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: Fail COMEDI_INSNLIST ioctl if n_insns is too large\n\nThe handling of the `COMEDI_INSNLIST` ioctl allocates a kernel buffer to\nhold the array of `struct comedi_insn`, getting the length from the\n`n_insns` member of the `struct comedi_insnlist` supplied by the user.\nThe allocation will fail with a WARNING and a stack dump if it is too\nlarge.\n\nAvoid that by failing with an `-EINVAL` error if the supplied `n_insns`\nvalue is unreasonable.\n\nDefine the limit on the `n_insns` value in the `MAX_INSNS` macro.  Set\nthis to the same value as `MAX_SAMPLES` (65536), which is the maximum\nallowed sum of the values of the member `n` in the array of `struct\ncomedi_insn`, and sensible comedi instructions will have an `n` of at\nleast 1."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: comedi: Error en el ioctl COMEDI_INSNLIST si n_insns es demasiado grande El manejo del ioctl `COMEDI_INSNLIST` asigna un b\u00fafer del kernel para contener la matriz de `struct comedi_insn`, obteniendo la longitud del miembro `n_insns` de la `struct comedi_insnlist` proporcionada por el usuario. La asignaci\u00f3n fallar\u00e1 con un WARNING y un volcado de pila si es demasiado grande. Ev\u00edtelo fallando con un error `-EINVAL` si el valor `n_insns` proporcionado no es razonable. Defina el l\u00edmite en el valor `n_insns` en la macro `MAX_INSNS`. Establezca esto en el mismo valor que `MAX_SAMPLES` (65536), que es la suma m\u00e1xima permitida de los valores del miembro `n` en la matriz de `struct comedi_insn`, y las instrucciones comedi sensatas tendr\u00e1n un `n` de al menos 1."
    }
  ],
  "id": "CVE-2025-38481",
  "lastModified": "2025-11-03T18:16:24.437",
  "metrics": {},
  "published": "2025-07-28T12:15:29.980",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/08ae4b20f5e82101d77326ecab9089e110f224cc"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/454d732dfd0aef7d7aa950c409215ca06d717e93"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/69dc06b9514522de532e997a21d035cd29b0db44"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/992d600f284e719242a434166e86c1999649b71c"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/c68257588e87f45530235701a42496b7e9e56adb"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/c9d3d9667443caafa804cd07940aeaef8e53aa90"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/d4c73ce13f5b5a0fe0319f1f352ff602f0ace8e3"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/e3b8322cc8081d142ee4c1a43e1d702bdba1ed76"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Awaiting Analysis"
}


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