FKIE_CVE-2021-47385

Vulnerability from fkie_nvd - Published: 2024-05-21 15:15 - Updated: 2024-12-23 21:01
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: hwmon: (w83792d) Fix NULL pointer dereference by removing unnecessary structure field If driver read val value sufficient for (val & 0x08) && (!(val & 0x80)) && ((val & 0x7) == ((val >> 4) & 0x7)) from device then Null pointer dereference occurs. (It is possible if tmp = 0b0xyz1xyz, where same literals mean same numbers) Also lm75[] does not serve a purpose anymore after switching to devm_i2c_new_dummy_device() in w83791d_detect_subclients(). The patch fixes possible NULL pointer dereference by removing lm75[]. Found by Linux Driver Verification project (linuxtesting.org). [groeck: Dropped unnecessary continuation lines, fixed multipline alignment]
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0f36b88173f028e372668ae040ab1a496834d278Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1499bb2c3a87a2efea0065adab2bd66badee61c3Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/200ced5ba724d8bbf29dfac4ed1e17a39ccaccd1Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/24af1fe376e22c42238a4a604d31e46c486876c3Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/0f36b88173f028e372668ae040ab1a496834d278Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/1499bb2c3a87a2efea0065adab2bd66badee61c3Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/200ced5ba724d8bbf29dfac4ed1e17a39ccaccd1Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/24af1fe376e22c42238a4a604d31e46c486876c3Patch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel 5.15
linux linux_kernel 5.15
linux linux_kernel 5.15
To clipboard 

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  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nhwmon: (w83792d) Fix NULL pointer dereference by removing unnecessary structure field\n\nIf driver read val value sufficient for\n(val \u0026 0x08) \u0026\u0026 (!(val \u0026 0x80)) \u0026\u0026 ((val \u0026 0x7) == ((val \u003e\u003e 4) \u0026 0x7))\nfrom device then Null pointer dereference occurs.\n(It is possible if tmp = 0b0xyz1xyz, where same literals mean same numbers)\nAlso lm75[] does not serve a purpose anymore after switching to\ndevm_i2c_new_dummy_device() in w83791d_detect_subclients().\n\nThe patch fixes possible NULL pointer dereference by removing lm75[].\n\nFound by Linux Driver Verification project (linuxtesting.org).\n\n[groeck: Dropped unnecessary continuation lines, fixed multipline alignment]"
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: hwmon: (w83792d) Corrija la desreferencia del puntero NULL eliminando el campo de estructura innecesario. Si el controlador lee el valor val suficiente para (val \u0026amp; 0x08) \u0026amp;\u0026amp; (!(val \u0026amp; 0x80)) \u0026amp;\u0026amp; (( val \u0026amp; 0x7) == ((val \u0026gt;\u0026gt; 4) \u0026amp; 0x7)) desde el dispositivo, luego se produce la desreferencia del puntero null. (Es posible si tmp = 0b0xyz1xyz, donde los mismos literales significan los mismos n\u00fameros) Adem\u00e1s, lm75[] ya no sirve para nada despu\u00e9s de cambiar a devm_i2c_new_dummy_device() en w83791d_detect_subclients(). El parche corrige la posible desreferencia del puntero NULL eliminando lm75[]. Encontrado por el proyecto de verificaci\u00f3n de controladores de Linux (linuxtesting.org). [groeck: Se eliminaron l\u00edneas de continuaci\u00f3n innecesarias, se corrigi\u00f3 la alineaci\u00f3n multil\u00ednea]"
    }
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  "id": "CVE-2021-47385",
  "lastModified": "2024-12-23T21:01:31.227",
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          "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"
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        "exploitabilityScore": 1.8,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
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  "published": "2024-05-21T15:15:24.020",
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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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