cve-2021-47386
Vulnerability from cvelistv5
Published
2024-05-21 15:03
Modified
2024-08-04 05:39
Severity ?
Summary
hwmon: (w83791d) Fix NULL pointer dereference by removing unnecessary structure field
Impacted products
LinuxLinux
LinuxLinux
Show details on NVD website


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                "role": "CISA Coordinator",
                "timestamp": "2024-05-28T18:28:32.870309Z",
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nhwmon: (w83791d) 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 multi-line alignment]"
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    "assignerShortName": "Linux",
    "cveId": "CVE-2021-47386",
    "datePublished": "2024-05-21T15:03:46.274Z",
    "dateReserved": "2024-05-21T14:58:30.813Z",
    "dateUpdated": "2024-08-04T05:39:59.316Z",
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    "nvd": "{\"cve\":{\"id\":\"CVE-2021-47386\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-05-21T15:15:24.117\",\"lastModified\":\"2024-05-21T16:54:26.047\",\"vulnStatus\":\"Awaiting Analysis\",\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nhwmon: (w83791d) 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 multi-line alignment]\"},{\"lang\":\"es\",\"value\":\" En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: hwmon: (w83791d) 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 de varias l\u00edneas]\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/16887ae4e3defd2c4e7913b6c539f33eaf4eac5c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/44d3c480e4e2a75bf6296a18b4356157991ccd80\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/516d9055039017a20a698103be2b556b4c976bb8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/943c15ac1b84d378da26bba41c83c67e16499ac4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
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  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
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