CVE-2025-38481 (GCVE-0-2025-38481)
Vulnerability from cvelistv5
Published
2025-07-28 11:21
Modified
2025-07-28 11:21
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
Impacted products
Vendor Product Version
Linux Linux Version: ed9eccbe8970f6eedc1b978c157caf1251a896d4
Version: ed9eccbe8970f6eedc1b978c157caf1251a896d4
Version: ed9eccbe8970f6eedc1b978c157caf1251a896d4
Version: ed9eccbe8970f6eedc1b978c157caf1251a896d4
Version: ed9eccbe8970f6eedc1b978c157caf1251a896d4
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{
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          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/comedi/comedi_fops.c"
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          ],
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          "vendor": "Linux",
          "versions": [
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              "version": "2.6.29"
            },
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.1.147",
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              "status": "unaffected",
              "version": "6.12.40",
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              "status": "unaffected",
              "version": "6.15.8",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.16",
              "versionType": "original_commit_for_fix"
            }
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        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
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              "negate": false,
              "operator": "OR"
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      ],
      "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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-07-28T11:21:46.147Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/d4c73ce13f5b5a0fe0319f1f352ff602f0ace8e3"
        },
        {
          "url": "https://git.kernel.org/stable/c/c9d3d9667443caafa804cd07940aeaef8e53aa90"
        },
        {
          "url": "https://git.kernel.org/stable/c/992d600f284e719242a434166e86c1999649b71c"
        },
        {
          "url": "https://git.kernel.org/stable/c/e3b8322cc8081d142ee4c1a43e1d702bdba1ed76"
        },
        {
          "url": "https://git.kernel.org/stable/c/08ae4b20f5e82101d77326ecab9089e110f224cc"
        }
      ],
      "title": "comedi: Fail COMEDI_INSNLIST ioctl if n_insns is too large",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-38481",
    "datePublished": "2025-07-28T11:21:46.147Z",
    "dateReserved": "2025-04-16T04:51:24.021Z",
    "dateUpdated": "2025-07-28T11:21:46.147Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-38481\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-07-28T12:15:29.980\",\"lastModified\":\"2025-07-29T14:14:29.590\",\"vulnStatus\":\"Awaiting Analysis\",\"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.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/08ae4b20f5e82101d77326ecab9089e110f224cc\",\"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/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\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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