fkie_cve-2025-40106
Vulnerability from fkie_nvd
Published
2025-10-31 10:15
Modified
2025-11-04 15:41
Severity ?
Summary
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.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2670932f2465793fea1ef073e40883e8390fa4d9
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4ffea48c69cb2b96a281cb7e5e42d706996631db
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/55520f65fd447e04099a2c44185453c18ea73b7e
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6db19822512396be1a3e1e20c16c97270285ba1a
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/87b318ba81dda2ee7b603f4f6c55e78ec3e95974
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8f3e4cd9be4b47246ea73ce5e3e0fa2f57f0d10c
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a4bb5d1bc2f238461bcbe5303eb500466690bb2c
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d4854eff25efb06d0d84c13e7129bbdba4125f8c
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: 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": "CVE-2025-40106",
  "lastModified": "2025-11-04T15:41:31.450",
  "metrics": {},
  "published": "2025-10-31T10:15:50.520",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/2670932f2465793fea1ef073e40883e8390fa4d9"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/4ffea48c69cb2b96a281cb7e5e42d706996631db"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/55520f65fd447e04099a2c44185453c18ea73b7e"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/6db19822512396be1a3e1e20c16c97270285ba1a"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/87b318ba81dda2ee7b603f4f6c55e78ec3e95974"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/8f3e4cd9be4b47246ea73ce5e3e0fa2f57f0d10c"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/a4bb5d1bc2f238461bcbe5303eb500466690bb2c"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/d4854eff25efb06d0d84c13e7129bbdba4125f8c"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Awaiting Analysis"
}


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