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

Vulnerability from cvelistv5 – Published: 2024-05-21 15:03 – Updated: 2025-06-19 12:56
VLAI?
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
References
Impacted products
Vendor Product Version
Linux Linux Affected: 358d2071100d84cfe6ef4a9d70ac0d998a1d501e , < 44d3c480e4e2a75bf6296a18b4356157991ccd80 (git)
Affected: 358d2071100d84cfe6ef4a9d70ac0d998a1d501e , < 516d9055039017a20a698103be2b556b4c976bb8 (git)
Affected: 358d2071100d84cfe6ef4a9d70ac0d998a1d501e , < 16887ae4e3defd2c4e7913b6c539f33eaf4eac5c (git)
Affected: 358d2071100d84cfe6ef4a9d70ac0d998a1d501e , < 943c15ac1b84d378da26bba41c83c67e16499ac4 (git)
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    Linux 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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  • 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.



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