GCVE Workshop - 22 September 2026 (14:00-18:00), Luxembourg Before The Vulnopticon Conference - Registration

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
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.
Show details on NVD website
To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/comedi/comedi_buf.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "4ffea48c69cb2b96a281cb7e5e42d706996631db",
              "status": "affected",
              "version": "ed9eccbe8970f6eedc1b978c157caf1251a896d4",
              "versionType": "git"
            },
            {
              "lessThan": "8f3e4cd9be4b47246ea73ce5e3e0fa2f57f0d10c",
              "status": "affected",
              "version": "ed9eccbe8970f6eedc1b978c157caf1251a896d4",
              "versionType": "git"
            },
            {
              "lessThan": "2670932f2465793fea1ef073e40883e8390fa4d9",
              "status": "affected",
              "version": "ed9eccbe8970f6eedc1b978c157caf1251a896d4",
              "versionType": "git"
            },
            {
              "lessThan": "6db19822512396be1a3e1e20c16c97270285ba1a",
              "status": "affected",
              "version": "ed9eccbe8970f6eedc1b978c157caf1251a896d4",
              "versionType": "git"
            },
            {
              "lessThan": "d4854eff25efb06d0d84c13e7129bbdba4125f8c",
              "status": "affected",
              "version": "ed9eccbe8970f6eedc1b978c157caf1251a896d4",
              "versionType": "git"
            },
            {
              "lessThan": "a4bb5d1bc2f238461bcbe5303eb500466690bb2c",
              "status": "affected",
              "version": "ed9eccbe8970f6eedc1b978c157caf1251a896d4",
              "versionType": "git"
            },
            {
              "lessThan": "55520f65fd447e04099a2c44185453c18ea73b7e",
              "status": "affected",
              "version": "ed9eccbe8970f6eedc1b978c157caf1251a896d4",
              "versionType": "git"
            },
            {
              "lessThan": "87b318ba81dda2ee7b603f4f6c55e78ec3e95974",
              "status": "affected",
              "version": "ed9eccbe8970f6eedc1b978c157caf1251a896d4",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/comedi/comedi_buf.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.29"
            },
            {
              "lessThan": "2.6.29",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.4.*",
              "status": "unaffected",
              "version": "5.4.301",
              "versionType": "semver"
            },
            {
              "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",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.17.*",
              "status": "unaffected",
              "version": "6.17.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.18",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.4.301",
                  "versionStartIncluding": "2.6.29",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.246",
                  "versionStartIncluding": "2.6.29",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.196",
                  "versionStartIncluding": "2.6.29",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.158",
                  "versionStartIncluding": "2.6.29",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.115",
                  "versionStartIncluding": "2.6.29",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.56",
                  "versionStartIncluding": "2.6.29",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.17.6",
                  "versionStartIncluding": "2.6.29",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18",
                  "versionStartIncluding": "2.6.29",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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": "2026-05-11T21:42:37.892Z",
        "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"
        },
        {
          "url": "https://git.kernel.org/stable/c/2670932f2465793fea1ef073e40883e8390fa4d9"
        },
        {
          "url": "https://git.kernel.org/stable/c/6db19822512396be1a3e1e20c16c97270285ba1a"
        },
        {
          "url": "https://git.kernel.org/stable/c/d4854eff25efb06d0d84c13e7129bbdba4125f8c"
        },
        {
          "url": "https://git.kernel.org/stable/c/a4bb5d1bc2f238461bcbe5303eb500466690bb2c"
        },
        {
          "url": "https://git.kernel.org/stable/c/55520f65fd447e04099a2c44185453c18ea73b7e"
        },
        {
          "url": "https://git.kernel.org/stable/c/87b318ba81dda2ee7b603f4f6c55e78ec3e95974"
        }
      ],
      "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": "2026-05-11T21:42:37.892Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2025-40106",
      "date": "2026-09-19",
      "epss": "0.00195",
      "percentile": "0.09563"
    },
    "microsoft_vex": {
      "current_release_date": "2025-11-01T01:02:23.000Z",
      "cve": "CVE-2025-40106",
      "id": "msrc_CVE-2025-40106",
      "initial_release_date": "2025-10-02T00:00:00.000Z",
      "product_status:known_not_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "comedi: fix divide-by-zero in comedi_buf_munge()",
      "url": "https://msrc.microsoft.com/csaf/vex/2025/msrc_cve-2025-40106.json",
      "version": "1"
    },
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "defaultStatus": "unaffected",
                "product": "Linux",
                "programFiles": [
                  "drivers/comedi/comedi_buf.c"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
                "versions": [
                  {
                    "lessThan": "4ffea48c69cb2b96a281cb7e5e42d706996631db",
                    "status": "affected",
                    "version": "ed9eccbe8970f6eedc1b978c157caf1251a896d4",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "8f3e4cd9be4b47246ea73ce5e3e0fa2f57f0d10c",
                    "status": "affected",
                    "version": "ed9eccbe8970f6eedc1b978c157caf1251a896d4",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "2670932f2465793fea1ef073e40883e8390fa4d9",
                    "status": "affected",
                    "version": "ed9eccbe8970f6eedc1b978c157caf1251a896d4",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "6db19822512396be1a3e1e20c16c97270285ba1a",
                    "status": "affected",
                    "version": "ed9eccbe8970f6eedc1b978c157caf1251a896d4",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "d4854eff25efb06d0d84c13e7129bbdba4125f8c",
                    "status": "affected",
                    "version": "ed9eccbe8970f6eedc1b978c157caf1251a896d4",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "a4bb5d1bc2f238461bcbe5303eb500466690bb2c",
                    "status": "affected",
                    "version": "ed9eccbe8970f6eedc1b978c157caf1251a896d4",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "55520f65fd447e04099a2c44185453c18ea73b7e",
                    "status": "affected",
                    "version": "ed9eccbe8970f6eedc1b978c157caf1251a896d4",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "87b318ba81dda2ee7b603f4f6c55e78ec3e95974",
                    "status": "affected",
                    "version": "ed9eccbe8970f6eedc1b978c157caf1251a896d4",
                    "versionType": "git"
                  }
                ]
              },
              {
                "defaultStatus": "affected",
                "product": "Linux",
                "programFiles": [
                  "drivers/comedi/comedi_buf.c"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
                "versions": [
                  {
                    "status": "affected",
                    "version": "2.6.29"
                  },
                  {
                    "lessThan": "2.6.29",
                    "status": "unaffected",
                    "version": "0",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "5.4.*",
                    "status": "unaffected",
                    "version": "5.4.301",
                    "versionType": "semver"
                  },
                  {
                    "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",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.17.*",
                    "status": "unaffected",
                    "version": "6.17.6",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "*",
                    "status": "unaffected",
                    "version": "6.18",
                    "versionType": "original_commit_for_fix"
                  }
                ]
              }
            ],
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
          }
        ],
        "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": "2026-06-17T09:21:16.473",
        "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": "Deferred"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "None",
      "current_release_date": "2026-06-30T10:34:18+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": "274",
      "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"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • 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.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • 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.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.