CVE-2025-38481 (GCVE-0-2025-38481)

Vulnerability from cvelistv5 – Published: 2025-07-28 11:21 – Updated: 2026-05-11 21:28
VLAI
Title
comedi: Fail COMEDI_INSNLIST ioctl if n_insns is too large
Summary
In the Linux kernel, the following vulnerability has been resolved: comedi: Fail COMEDI_INSNLIST ioctl if n_insns is too large The handling of the `COMEDI_INSNLIST` ioctl allocates a kernel buffer to hold the array of `struct comedi_insn`, getting the length from the `n_insns` member of the `struct comedi_insnlist` supplied by the user. The allocation will fail with a WARNING and a stack dump if it is too large. Avoid that by failing with an `-EINVAL` error if the supplied `n_insns` value is unreasonable. Define the limit on the `n_insns` value in the `MAX_INSNS` macro. Set this to the same value as `MAX_SAMPLES` (65536), which is the maximum allowed sum of the values of the member `n` in the array of `struct comedi_insn`, and sensible comedi instructions will have an `n` of at least 1.
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7018 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: ed9eccbe8970f6eedc1b978c157caf1251a896d4 , < 454d732dfd0aef7d7aa950c409215ca06d717e93 (git)
Affected: ed9eccbe8970f6eedc1b978c157caf1251a896d4 , < c68257588e87f45530235701a42496b7e9e56adb (git)
Affected: ed9eccbe8970f6eedc1b978c157caf1251a896d4 , < 69dc06b9514522de532e997a21d035cd29b0db44 (git)
Affected: ed9eccbe8970f6eedc1b978c157caf1251a896d4 , < d4c73ce13f5b5a0fe0319f1f352ff602f0ace8e3 (git)
Affected: ed9eccbe8970f6eedc1b978c157caf1251a896d4 , < c9d3d9667443caafa804cd07940aeaef8e53aa90 (git)
Affected: ed9eccbe8970f6eedc1b978c157caf1251a896d4 , < 992d600f284e719242a434166e86c1999649b71c (git)
Affected: ed9eccbe8970f6eedc1b978c157caf1251a896d4 , < e3b8322cc8081d142ee4c1a43e1d702bdba1ed76 (git)
Affected: ed9eccbe8970f6eedc1b978c157caf1251a896d4 , < 08ae4b20f5e82101d77326ecab9089e110f224cc (git)
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Linux Linux Affected: 2.6.29
Unaffected: 0 , < 2.6.29 (semver)
Unaffected: 5.4.297 , ≤ 5.4.* (semver)
Unaffected: 5.10.241 , ≤ 5.10.* (semver)
Unaffected: 5.15.190 , ≤ 5.15.* (semver)
Unaffected: 6.1.147 , ≤ 6.1.* (semver)
Unaffected: 6.6.100 , ≤ 6.6.* (semver)
Unaffected: 6.12.40 , ≤ 6.12.* (semver)
Unaffected: 6.15.8 , ≤ 6.15.* (semver)
Unaffected: 6.16 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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          {
            "lang": "es",
            "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: comedi: Error en el ioctl COMEDI_INSNLIST si n_insns es demasiado grande El manejo del ioctl `COMEDI_INSNLIST` asigna un b\u00fafer del kernel para contener la matriz de `struct comedi_insn`, obteniendo la longitud del miembro `n_insns` de la `struct comedi_insnlist` proporcionada por el usuario. La asignaci\u00f3n fallar\u00e1 con un WARNING y un volcado de pila si es demasiado grande. Ev\u00edtelo fallando con un error `-EINVAL` si el valor `n_insns` proporcionado no es razonable. Defina el l\u00edmite en el valor `n_insns` en la macro `MAX_INSNS`. Establezca esto en el mismo valor que `MAX_SAMPLES` (65536), que es la suma m\u00e1xima permitida de los valores del miembro `n` en la matriz de `struct comedi_insn`, y las instrucciones comedi sensatas tendr\u00e1n un `n` de al menos 1."
          }
        ],
        "id": "CVE-2025-38481",
        "lastModified": "2026-06-17T09:16:57.047",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 5.5,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 1.8,
              "impactScore": 3.6,
              "source": "nvd@nist.gov",
              "type": "Primary"
            }
          ]
        },
        "published": "2025-07-28T12:15:29.980",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/08ae4b20f5e82101d77326ecab9089e110f224cc"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/454d732dfd0aef7d7aa950c409215ca06d717e93"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/69dc06b9514522de532e997a21d035cd29b0db44"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/992d600f284e719242a434166e86c1999649b71c"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/c68257588e87f45530235701a42496b7e9e56adb"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/c9d3d9667443caafa804cd07940aeaef8e53aa90"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/d4c73ce13f5b5a0fe0319f1f352ff602f0ace8e3"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/e3b8322cc8081d142ee4c1a43e1d702bdba1ed76"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "tags": [
              "Third Party Advisory"
            ],
            "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "tags": [
              "Third Party Advisory"
            ],
            "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Analyzed",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "NVD-CWE-noinfo"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "None",
      "current_release_date": "2026-06-30T10:23:59+00:00",
      "cve": "CVE-2025-38481",
      "id": "CVE-2025-38481",
      "initial_release_date": "2025-07-28T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: comedi: Fail COMEDI_INSNLIST ioctl if n_insns is too large",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-38481.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "low",
      "current_release_date": "2026-11-01T01:26:07Z",
      "cve": "CVE-2025-38481",
      "id": "CVE-2025-38481",
      "initial_release_date": "2025-07-28T23:22:43Z",
      "product_status:known_affected": "793",
      "product_status:known_not_affected": "43",
      "product_status:recommended": "503",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2025-38481",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/2025/cve-2025-38481.json",
      "version": "48"
    }
  }
}



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