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CVE-2026-31750

Estado: AnalizadaMedia (5.5)—

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

comedi: runflags cannot determine whether to reclaim chanlist

syzbot reported a memory leak [1], because commit 4e1da516debb ("comedi: Add reference counting for Comedi command handling") did not consider the exceptional exit case in do_cmd_ioctl() where runflags is not set. This caused chanlist not to be properly freed by do_become_nonbusy(), as it only frees chanlist when runflags is correctly set.

Added a check in do_become_nonbusy() for the case where runflags is not set, to properly free the chanlist memory.

Detalles técnicos trazas, registros y código del informe original
[1]
BUG: memory leak
  backtrace (crc 844a0efa):
    __comedi_get_user_chanlist drivers/comedi/comedi_fops.c:1815 [inline]
    do_cmd_ioctl.part.0+0x112/0x350 drivers/comedi/comedi_fops.c:1890
    do_cmd_ioctl drivers/comedi/comedi_fops.c:1858 [inline]

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)

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{
  "id": "CVE-2026-31750",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 5.5,
          "attackVector": "LOCAL",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 1.8
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  },
  "affected": [
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      "affectedData": [
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4e1da516debbe6a573ffa0392e2809d180d0575c",
              "lessThan": "830c848aba9f047eb6b34288975ebeb8e8621451",
              "versionType": "git"
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            {
              "status": "affected",
              "version": "4e1da516debbe6a573ffa0392e2809d180d0575c",
              "lessThan": "29f644f14b89e6c4965e3c89251929e451190a66",
              "versionType": "git"
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          ],
          "programFiles": [
            "drivers/comedi/comedi_fops.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.19"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "6.19",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "6.19.12",
              "versionType": "semver",
              "lessThanOrEqual": "6.19.*"
            },
            {
              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "drivers/comedi/comedi_fops.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-05-01T15:16:37.850",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/29f644f14b89e6c4965e3c89251929e451190a66",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/830c848aba9f047eb6b34288975ebeb8e8621451",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-401"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncomedi: runflags cannot determine whether to reclaim chanlist\n\nsyzbot reported a memory leak [1], because commit 4e1da516debb (\"comedi:\nAdd reference counting for Comedi command handling\") did not consider\nthe exceptional exit case in do_cmd_ioctl() where runflags is not set.\nThis caused chanlist not to be properly freed by do_become_nonbusy(),\nas it only frees chanlist when runflags is correctly set.\n\nAdded a check in do_become_nonbusy() for the case where runflags is not\nset, to properly free the chanlist memory.\n\n[1]\nBUG: memory leak\n  backtrace (crc 844a0efa):\n    __comedi_get_user_chanlist drivers/comedi/comedi_fops.c:1815 [inline]\n    do_cmd_ioctl.part.0+0x112/0x350 drivers/comedi/comedi_fops.c:1890\n    do_cmd_ioctl drivers/comedi/comedi_fops.c:1858 [inline]"
    }
  ],
  "lastModified": "2026-06-17T10:34:23.650",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
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  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}