ghsa-6hvg-fq9h-5pm6
Vulnerability from github
Published
2025-10-31 12:30
Modified
2025-10-31 12:30
Details

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

comedi: fix divide-by-zero in comedi_buf_munge()

The comedi_buf_munge() function performs a modulo operation async->munge_chan %= async->cmd.chanlist_len without first checking if chanlist_len is zero. If a user program submits a command with chanlist_len set to zero, this causes a divide-by-zero error when the device processes data in the interrupt handler path.

Add a check for zero chanlist_len at the beginning of the function, similar to the existing checks for !map and CMDF_RAWDATA flag. When chanlist_len is zero, update munge_count and return early, indicating the data was handled without munging.

This prevents potential kernel panics from malformed user commands.

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{
  "affected": [],
  "aliases": [
    "CVE-2025-40106"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-10-31T10:15:50Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ncomedi: fix divide-by-zero in comedi_buf_munge()\n\nThe comedi_buf_munge() function performs a modulo operation\n`async-\u003emunge_chan %= async-\u003ecmd.chanlist_len` without first\nchecking if chanlist_len is zero. If a user program submits a command with\nchanlist_len set to zero, this causes a divide-by-zero error when the device\nprocesses data in the interrupt handler path.\n\nAdd a check for zero chanlist_len at the beginning of the\nfunction, similar to the existing checks for !map and\nCMDF_RAWDATA flag. When chanlist_len is zero, update\nmunge_count and return early, indicating the data was\nhandled without munging.\n\nThis prevents potential kernel panics from malformed user commands.",
  "id": "GHSA-6hvg-fq9h-5pm6",
  "modified": "2025-10-31T12:30:21Z",
  "published": "2025-10-31T12:30:21Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-40106"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2670932f2465793fea1ef073e40883e8390fa4d9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4ffea48c69cb2b96a281cb7e5e42d706996631db"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/55520f65fd447e04099a2c44185453c18ea73b7e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6db19822512396be1a3e1e20c16c97270285ba1a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/87b318ba81dda2ee7b603f4f6c55e78ec3e95974"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8f3e4cd9be4b47246ea73ce5e3e0fa2f57f0d10c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a4bb5d1bc2f238461bcbe5303eb500466690bb2c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d4854eff25efb06d0d84c13e7129bbdba4125f8c"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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