5.5

CVE-2021-47385: hwmon: (w83792d) Fix NULL pointer dereference by removing unnecessary structure field

Analyzed
AliasesUBUNTU-CVE-2021-47385DEBIAN-CVE-2021-47385
Published 21-05-2024Last modified 11-05-2026

Vulnerability summary

CVE-2021-47385 is a medium (CVSS 5.5) NULL Pointer Dereference vulnerability in linux. EPSS estimates a 0.24% chance of exploitation in the next 30 days, higher than 15.3% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 5.5, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
5.5/10
010
Medium · v3.1 (NVD)
EPSS score
0.24%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 20 · Related 13
RHSA-2024:5281RHSA-2024:6206RHSA-2024:7000RHSA-2024:7001RHSA-2024:8157RHSA-2024:8158

Timeline

  1. 21-05-2024
    PublishedVulnerability first disclosed.
  2. 11-05-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: hwmon: (w83792d) 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 multipline alignment]

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.24%

Chance of exploitation in the next 30 days

Percentile

15%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.24% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu88 products
  • linuxAll versions (No fix recorded) | < 4.4.0-276.310 | < 4.15.0-245.257 | < 5.4.0-91.102
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws< 4.4.0-1150.156 | < 4.4.0-1188.203 | < 4.15.0-1187.200 | < 5.4.0-1060.63
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ f64211151db4269341ee6432ce832ae3756725ad, < 200ced5ba724d8bbf29dfac4ed1e17a39ccaccd1 | ≥ f64211151db4269341ee6432ce832ae3756725ad, < 1499bb2c3a87a2efea0065adab2bd66badee61c3 | ≥ f64211151db4269341ee6432ce832ae3756725ad, < 24af1fe376e22c42238a4a604d31e46c486876c3 | ≥ f64211151db4269341ee6432ce832ae3756725ad, < 0f36b88173f028e372668ae040ab1a496834d278 | 5.4
  • linux_kernel< 5.4.151 | ≥ 5.5, < 5.10.71 | ≥ 5.11, < 5.14.10 | 5.15:rc1 | 5.15:rc2 | 5.15:rc3
Debian1 product
  • linux< 5.14.12-1

3 vendors · 91 products

References

16 links
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