Vulnerability-Lookup

GHSA-2WCP-6FQ9-MCR6

Vulnerability from github – Published: 2024-05-21 15:31 – Updated: 2024-11-13 21:30

Details

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

hwmon: (w83791d) 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 multi-line alignment]

Severity ?

7.8 (High)


                  
                    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2021-47386"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-476"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-05-21T15:15:24Z",
    "severity": "HIGH"
  },
  "details": "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]",
  "id": "GHSA-2wcp-6fq9-mcr6",
  "modified": "2024-11-13T21:30:31Z",
  "published": "2024-05-21T15:31:44Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-47386"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/16887ae4e3defd2c4e7913b6c539f33eaf4eac5c"
    },
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      "url": "https://git.kernel.org/stable/c/44d3c480e4e2a75bf6296a18b4356157991ccd80"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/516d9055039017a20a698103be2b556b4c976bb8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/943c15ac1b84d378da26bba41c83c67e16499ac4"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2021-47386 (GCVE-0-2021-47386)

Vulnerability from cvelistv5 – Published: 2024-05-21 15:03 – Updated: 2025-06-19 12:56

Title

hwmon: (w83791d) Fix NULL pointer dereference by removing unnecessary structure field

Summary

In the Linux kernel, the following vulnerability has been resolved: hwmon: (w83791d) 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 multi-line alignment]

Severity ?

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CWE

CWE-476 - NULL Pointer Dereference

Assigner

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/44d3c480e4e2a75bf…
	https://git.kernel.org/stable/c/516d9055039017a20…
	https://git.kernel.org/stable/c/16887ae4e3defd2c4…
	https://git.kernel.org/stable/c/943c15ac1b84d378d…

Impacted products

Vendor

Product

Version

Linux

Affected: 358d2071100d84cfe6ef4a9d70ac0d998a1d501e , < 44d3c480e4e2a75bf6296a18b4356157991ccd80 (git)
Affected: 358d2071100d84cfe6ef4a9d70ac0d998a1d501e , < 516d9055039017a20a698103be2b556b4c976bb8 (git)
Affected: 358d2071100d84cfe6ef4a9d70ac0d998a1d501e , < 16887ae4e3defd2c4e7913b6c539f33eaf4eac5c (git)
Affected: 358d2071100d84cfe6ef4a9d70ac0d998a1d501e , < 943c15ac1b84d378da26bba41c83c67e16499ac4 (git)

Linux

Affected: 5.4
Unaffected: 0 , < 5.4 (semver)
Unaffected: 5.4.151 , ≤ 5.4.* (semver)
Unaffected: 5.10.71 , ≤ 5.10.* (semver)
Unaffected: 5.14.10 , ≤ 5.14.* (semver)
Unaffected: 5.15 , ≤ * (original_commit_for_fix)

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JSON

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Sightings

Author	Source	Type	Date

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.

Action not permitted

GHSA-2WCP-6FQ9-MCR6

CVE-2021-47386 (GCVE-0-2021-47386)

Tags

Sightings

Nomenclature