FKIE_CVE-2025-39685

Vulnerability from fkie_nvd - Published: 2025-09-05 18:15 - Updated: 2026-10-19 21:10
Severity
7.1 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: comedi: pcl726: Prevent invalid irq number The reproducer passed in an irq number(0x80008000) that was too large, which triggered the oob. Added an interrupt number check to prevent users from passing in an irq number that was too large. If `it->options[1]` is 31, then `1 << it->options[1]` is still invalid because it shifts a 1-bit into the sign bit (which is UB in C). Possible solutions include reducing the upper bound on the `it->options[1]` value to 30 or lower, or using `1U << it->options[1]`. The old code would just not attempt to request the IRQ if the `options[1]` value were invalid. And it would still configure the device without interrupts even if the call to `request_irq` returned an error. So it would be better to combine this test with the test below.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0eb4ed2aa261dee228f1668dbfa6d87353e8162dPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5a33d07c94ba91306093e823112a7aa9727549f6Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/96cb948408b3adb69df7e451ba7da9d21f814d00Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a3cfcd0c78c80ca7cd80372dc28f77d01be57bf6Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/bab220b0bb5af652007e278e8e8357f952b0e1eaPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d8992c9a01f81128f36acb7c5755530e21fcd059Patch
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2025/10/msg00008.htmlThird Party Advisory
0b142b55-0307-4c5a-b3c9-f314f3fb7c5ehttps://cert-portal.siemens.com/productcert/html/ssa-032379.html
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel 6.17
linux linux_kernel 6.17
debian debian_linux 11.0
To clipboard 

{
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      "affectedData": [
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          "product": "Linux",
          "programFiles": [
            "drivers/comedi/drivers/pcl726.c"
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              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/comedi/drivers/pcl726.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "affected",
              "version": "3.13"
            },
            {
              "lessThan": "3.13",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
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              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.190",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.149",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.103",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.44",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.16.*",
              "status": "unaffected",
              "version": "6.16.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.17",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "affectedData": [
        {
          "defaultStatus": "unknown",
          "product": "SIMATIC CN 4100",
          "vendor": "Siemens",
          "versions": [
            {
              "lessThan": "V5.0",
              "status": "affected",
              "version": "0",
              "versionType": "custom"
            }
          ]
        }
      ],
      "source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"
    }
  ],
  "configurations": [
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      "nodes": [
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  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncomedi: pcl726: Prevent invalid irq number\n\nThe reproducer passed in an irq number(0x80008000) that was too large,\nwhich triggered the oob.\n\nAdded an interrupt number check to prevent users from passing in an irq\nnumber that was too large.\n\nIf `it-\u003eoptions[1]` is 31, then `1 \u003c\u003c it-\u003eoptions[1]` is still invalid\nbecause it shifts a 1-bit into the sign bit (which is UB in C).\nPossible solutions include reducing the upper bound on the\n`it-\u003eoptions[1]` value to 30 or lower, or using `1U \u003c\u003c it-\u003eoptions[1]`.\n\nThe old code would just not attempt to request the IRQ if the\n`options[1]` value were invalid.  And it would still configure the\ndevice without interrupts even if the call to `request_irq` returned an\nerror.  So it would be better to combine this test with the test below."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\ncomedi: pcl726: Prevenir n\u00famero de irq inv\u00e1lido\n\nEl reproductor pas\u00f3 un n\u00famero de irq (0x80008000) que era demasiado grande, lo que activ\u00f3 el oob.\n\nSe a\u00f1adi\u00f3 una comprobaci\u00f3n del n\u00famero de interrupci\u00f3n para evitar que los usuarios pasen un n\u00famero de irq que sea demasiado grande.\n\nSi \u201cit-\u003eoptions[1]\u201d es 31, entonces \u201c1 \u003c\u003c it-\u003eoptions[1]\u201d sigue siendo inv\u00e1lido porque desplaza un bit 1 al bit de signo (lo cual es UB en C). Las posibles soluciones incluyen reducir el l\u00edmite superior del valor de \u201cit-\u003eoptions[1]\u201d a 30 o menos, o usar \u201c1U \u003c\u003c it-\u003eoptions[1]\u201d.\n\nEl c\u00f3digo antiguo simplemente no intentar\u00eda solicitar la IRQ si el valor de \u201coptions[1]\u201d fuera inv\u00e1lido. Y a\u00fan as\u00ed configurar\u00eda el dispositivo sin interrupciones incluso si la llamada a \u201crequest_irq\u201d devolviera un error. As\u00ed que ser\u00eda mejor combinar esta prueba con la prueba de abajo."
    }
  ],
  "id": "CVE-2025-39685",
  "lastModified": "2026-10-19T21:10:00.160",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.1,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.2,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2025-09-05T18:15:45.160",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/0eb4ed2aa261dee228f1668dbfa6d87353e8162d"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
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      "url": "https://git.kernel.org/stable/c/5a33d07c94ba91306093e823112a7aa9727549f6"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/96cb948408b3adb69df7e451ba7da9d21f814d00"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/a3cfcd0c78c80ca7cd80372dc28f77d01be57bf6"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/bab220b0bb5af652007e278e8e8357f952b0e1ea"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/d8992c9a01f81128f36acb7c5755530e21fcd059"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"
    },
    {
      "source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e",
      "url": "https://cert-portal.siemens.com/productcert/html/ssa-032379.html"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-125"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}



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