CVE-2021-47386hwmon: (w83791d) Fix NULL pointer dereference by removing unnecessary structure field
- 7.8HighCVSS base score
- 0.26%Exploitation in 30 daysEPSS · top 83% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
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]
Timeline
ID reserved
By Linux
Published
- 24 months later
· 24 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| CISA-ADPADP (enrichment) | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Analyzed | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.26% · top 83% of all CVEs (13 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.8.
Affected products
- affected 358d2071100d84cfe6ef4a9d70ac0d998a1d501e – < 44d3c480e4e2a75bf6296a18b4356157991ccd80
- affected 358d2071100d84cfe6ef4a9d70ac0d998a1d501e – < 516d9055039017a20a698103be2b556b4c976bb8
- affected 358d2071100d84cfe6ef4a9d70ac0d998a1d501e – < 16887ae4e3defd2c4e7913b6c539f33eaf4eac5c
- affected 358d2071100d84cfe6ef4a9d70ac0d998a1d501e – < 943c15ac1b84d378da26bba41c83c67e16499ac4
- affected 5.4
- unaffected < 5.4
- unaffected 5.4.151 – ≤ 5.4.*
- unaffected 5.10.71 – ≤ 5.10.*
- unaffected 5.14.10 – ≤ 5.14.*
- unaffected 5.15 – ≤ *
References
References4
- https://git.kernel.org/stable/c/44d3c480e4e2a75bf6296a18b4356157991ccd80 (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/516d9055039017a20a698103be2b556b4c976bb8 (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/16887ae4e3defd2c4e7913b6c539f33eaf4eac5c (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/943c15ac1b84d378da26bba41c83c67e16499ac4 (opens in a new tab)x_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2021-34391 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2021-47386)Record last updated .