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CVE-2022-49285

Estado: AnalizadaMedia (5.5)—

In the Linux kernel, the following vulnerability has been resolved:

iio: accel: mma8452: use the correct logic to get mma8452_data

The original logic to get mma8452_data is wrong, the *dev point to the device belong to iio_dev. we can't use this dev to find the correct i2c_client. The original logic happen to work because it finally use dev->driver_data to get iio_dev. Here use the API to_i2c_client() is wrong and make reader confuse. To correct the logic, it should be like this

But after commit 8b7651f25962 ("iio: iio_device_alloc(): Remove unnecessary self drvdata"), the upper logic also can't work. When try to show the avialable scale in userspace, will meet kernel dump, kernel handle NULL pointer dereference.

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So use dev_to_iio_dev() to correct the logic.

Dual fixes tags as the second reflects when the bug was exposed, whilst the first reflects when the original bug was introduced.

Detalles técnicos trazas, registros y código del informe original
  struct mma8452_data *data = iio_priv(dev_get_drvdata(dev));

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2022-49285",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 5.5,
          "attackVector": "LOCAL",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 1.8
      }
    ]
  },
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "c3cdd6e48e35b7a02f28e301ef30a87ff3cd6527",
              "lessThan": "4c0bb583a4444cce224e8661090cbffc98e2fe07",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "c3cdd6e48e35b7a02f28e301ef30a87ff3cd6527",
              "lessThan": "d2d9ebdbff79d87d27652578e6d1638ad3b5f3bf",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "c3cdd6e48e35b7a02f28e301ef30a87ff3cd6527",
              "lessThan": "c87b7b12f48db86ac9909894f4dc0107d7df6375",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "drivers/iio/accel/mma8452.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.4"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "4.4",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "5.15.54",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "status": "unaffected",
              "version": "5.17.2",
              "versionType": "semver",
              "lessThanOrEqual": "5.17.*"
            },
            {
              "status": "unaffected",
              "version": "5.18",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "drivers/iio/accel/mma8452.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2025-02-26T07:01:05.360",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/4c0bb583a4444cce224e8661090cbffc98e2fe07",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/c87b7b12f48db86ac9909894f4dc0107d7df6375",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/d2d9ebdbff79d87d27652578e6d1638ad3b5f3bf",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-476"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\niio: accel: mma8452: use the correct logic to get mma8452_data\n\nThe original logic to get mma8452_data is wrong, the *dev point to\nthe device belong to iio_dev. we can't use this dev to find the\ncorrect i2c_client. The original logic happen to work because it\nfinally use dev->driver_data to get iio_dev. Here use the API\nto_i2c_client() is wrong and make reader confuse. To correct the\nlogic, it should be like this\n\n  struct mma8452_data *data = iio_priv(dev_get_drvdata(dev));\n\nBut after commit 8b7651f25962 (\"iio: iio_device_alloc(): Remove\nunnecessary self drvdata\"), the upper logic also can't work.\nWhen try to show the avialable scale in userspace, will meet kernel\ndump, kernel handle NULL pointer dereference.\n\nSo use dev_to_iio_dev() to correct the logic.\n\nDual fixes tags as the second reflects when the bug was exposed, whilst\nthe first reflects when the original bug was introduced."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: iio: accel: mma8452: usa la lógica correcta para obtener mma8452_data La lógica original para obtener mma8452_data es incorrecta, el punto *dev al dispositivo pertenece a iio_dev. No podemos usar este dev para encontrar el i2c_client correcto. La lógica original funcionó porque finalmente usó dev->driver_data para obtener iio_dev. Aquí, usar la API to_i2c_client() es incorrecto y confunde al lector. Para corregir la lógica, debería ser así struct mma8452_data *data = iio_priv(dev_get_drvdata(dev)); Pero después de el commit 8b7651f25962 (\"iio: iio_device_alloc(): eliminar drvdata propios innecesarios\"), la lógica superior tampoco puede funcionar. Cuando se intenta mostrar la escala disponible en el espacio de usuario, se produce un volcado del kernel y una desreferencia del puntero NULL del manejador del kernel. Por lo tanto, se utiliza dev_to_iio_dev() para corregir la lógica. Dual corrige las etiquetas, ya que la segunda refleja cuándo se expuso el error, mientras que la primera refleja cuándo se introdujo el error original."
    }
  ],
  "lastModified": "2026-06-17T05:17:36.020",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "9E8D5013-720C-47BB-99C7-6FFAC63DA99A",
              "versionEndExcluding": "5.15.54",
              "versionStartIncluding": "4.4"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "375454EC-B553-4CC9-BF9D-4A8ADC4F34BD",
              "versionEndExcluding": "5.17.2",
              "versionStartIncluding": "5.16"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}