CVE-2025-40106 (GCVE-0-2025-40106)

Vulnerability from cvelistv5 – Published: 2025-10-31 09:41 – Updated: 2025-12-01 06:18
VLAI?
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.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 4ffea48c69cb2b96a281cb7e5e42d706996631db (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 8f3e4cd9be4b47246ea73ce5e3e0fa2f57f0d10c (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 2670932f2465793fea1ef073e40883e8390fa4d9 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 6db19822512396be1a3e1e20c16c97270285ba1a (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < d4854eff25efb06d0d84c13e7129bbdba4125f8c (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < a4bb5d1bc2f238461bcbe5303eb500466690bb2c (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 55520f65fd447e04099a2c44185453c18ea73b7e (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 87b318ba81dda2ee7b603f4f6c55e78ec3e95974 (git)
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    Linux Linux Unaffected: 5.4.301 , ≤ 5.4.* (semver)
Unaffected: 5.10.246 , ≤ 5.10.* (semver)
Unaffected: 5.15.196 , ≤ 5.15.* (semver)
Unaffected: 6.1.158 , ≤ 6.1.* (semver)
Unaffected: 6.6.115 , ≤ 6.6.* (semver)
Unaffected: 6.12.56 , ≤ 6.12.* (semver)
Unaffected: 6.17.6 , ≤ 6.17.* (semver)
Unaffected: 6.18 , ≤ * (original_commit_for_fix)
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{
  "containers": {
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/comedi/comedi_buf.c"
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          "product": "Linux",
          "programFiles": [
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "unaffected",
              "version": "5.4.301",
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            },
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              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.246",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.196",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.158",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.115",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.56",
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            },
            {
              "lessThanOrEqual": "6.17.*",
              "status": "unaffected",
              "version": "6.17.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.18",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
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      "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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-12-01T06:18:09.768Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/4ffea48c69cb2b96a281cb7e5e42d706996631db"
        },
        {
          "url": "https://git.kernel.org/stable/c/8f3e4cd9be4b47246ea73ce5e3e0fa2f57f0d10c"
        },
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          "url": "https://git.kernel.org/stable/c/2670932f2465793fea1ef073e40883e8390fa4d9"
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        },
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        },
        {
          "url": "https://git.kernel.org/stable/c/87b318ba81dda2ee7b603f4f6c55e78ec3e95974"
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      ],
      "title": "comedi: fix divide-by-zero in comedi_buf_munge()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-40106",
    "datePublished": "2025-10-31T09:41:46.740Z",
    "dateReserved": "2025-04-16T07:20:57.166Z",
    "dateUpdated": "2025-12-01T06:18:09.768Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
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  }
}


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Sightings

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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
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  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.