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

Vulnerability from cvelistv5 – Published: 2025-10-31 09:41 – Updated: 2026-05-11 21:42
VLAI
Title
comedi: fix divide-by-zero in comedi_buf_munge()
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
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6653 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: ed9eccbe8970f6eedc1b978c157caf1251a896d4 , < 4ffea48c69cb2b96a281cb7e5e42d706996631db (git)
Affected: ed9eccbe8970f6eedc1b978c157caf1251a896d4 , < 8f3e4cd9be4b47246ea73ce5e3e0fa2f57f0d10c (git)
Affected: ed9eccbe8970f6eedc1b978c157caf1251a896d4 , < 2670932f2465793fea1ef073e40883e8390fa4d9 (git)
Affected: ed9eccbe8970f6eedc1b978c157caf1251a896d4 , < 6db19822512396be1a3e1e20c16c97270285ba1a (git)
Affected: ed9eccbe8970f6eedc1b978c157caf1251a896d4 , < d4854eff25efb06d0d84c13e7129bbdba4125f8c (git)
Affected: ed9eccbe8970f6eedc1b978c157caf1251a896d4 , < a4bb5d1bc2f238461bcbe5303eb500466690bb2c (git)
Affected: ed9eccbe8970f6eedc1b978c157caf1251a896d4 , < 55520f65fd447e04099a2c44185453c18ea73b7e (git)
Affected: ed9eccbe8970f6eedc1b978c157caf1251a896d4 , < 87b318ba81dda2ee7b603f4f6c55e78ec3e95974 (git)
guessed Create a notification for this product.
Linux Linux Affected: 2.6.29
Unaffected: 0 , < 2.6.29 (semver)
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)
guessed Create a notification for this product.
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        {
          "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": "2026-05-11T21:42:37.892Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/8f3e4cd9be4b47246ea73ce5e3e0fa2f57f0d10c"
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-40106",
    "datePublished": "2025-10-31T09:41:46.740Z",
    "dateReserved": "2025-04-16T07:20:57.166Z",
    "dateUpdated": "2026-05-11T21:42:37.892Z",
    "state": "PUBLISHED"
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      "cve": "CVE-2025-40106",
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      "status": "final",
      "title": "comedi: fix divide-by-zero in comedi_buf_munge()",
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          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\ncomedi: correcci\u00f3n de divisi\u00f3n por cero en comedi_buf_munge()\n\nLa funci\u00f3n comedi_buf_munge() realiza una operaci\u00f3n de m\u00f3dulo \u0027async-\u003emunge_chan %= async-\u003ecmd.chanlist_len\u0027 sin comprobar primero si chanlist_len es cero. Si un programa de usuario env\u00eda un comando con chanlist_len establecido en cero, esto causa un error de divisi\u00f3n por cero cuando el dispositivo procesa datos en la ruta del gestor de interrupciones.\n\nA\u00f1adir una comprobaci\u00f3n para chanlist_len cero al principio de la funci\u00f3n, similar a las comprobaciones existentes para !map y el flag CMDF_RAWDATA. Cuando chanlist_len es cero, actualizar munge_count y retornar anticipadamente, indicando que los datos fueron gestionados sin munging.\n\nEsto previene posibles p\u00e1nicos del kernel de comandos de usuario malformados."
          }
        ],
        "id": "CVE-2025-40106",
        "lastModified": "2026-10-19T21:10:00.160",
        "metrics": {},
        "published": "2025-10-31T10:15:50.520",
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          },
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            "url": "https://git.kernel.org/stable/c/d4854eff25efb06d0d84c13e7129bbdba4125f8c"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Deferred"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "None",
      "current_release_date": "2026-11-07T11:13:10+00:00",
      "cve": "CVE-2025-40106",
      "id": "CVE-2025-40106",
      "initial_release_date": "2025-10-31T00:00:00+00:00",
      "product_status:known_not_affected": "200",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: comedi: fix divide-by-zero in comedi_buf_munge()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-40106.json",
      "version": "3"
    }
  }
}



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How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

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