CVE-2021-47384 (GCVE-0-2021-47384)

Vulnerability from cvelistv5 – Published: 2024-05-21 15:03 – Updated: 2025-06-19 12:56
VLAI?
Title
hwmon: (w83793) Fix NULL pointer dereference by removing unnecessary structure field
Summary
In the Linux kernel, the following vulnerability has been resolved: hwmon: (w83793) Fix NULL pointer dereference by removing unnecessary structure field If driver read tmp value sufficient for (tmp & 0x08) && (!(tmp & 0x80)) && ((tmp & 0x7) == ((tmp >> 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 alignments]
Severity ?
5.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
CWE
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: cf48d17623281c2b3185030ed23f148bd47e15de , < 6cb01fe630eaffc5a2c3f7364436caddba286623 (git)
Affected: cf48d17623281c2b3185030ed23f148bd47e15de , < 7c4fd5de39f273626a2b0f3a446d2cc85cd47616 (git)
Affected: cf48d17623281c2b3185030ed23f148bd47e15de , < 746011193f44f97f8784edcf8327c587946745fc (git)
Affected: cf48d17623281c2b3185030ed23f148bd47e15de , < dd4d747ef05addab887dc8ff0d6ab9860bbcd783 (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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