5.3

CVE-2021-47384: hwmon: (w83793) Fix NULL pointer dereference by removing unnecessary structure field

Analyzed
AliasesUBUNTU-CVE-2021-47384DEBIAN-CVE-2021-47384
Published 21-05-2024Last modified 11-05-2026

Vulnerability summary

CVE-2021-47384 is a medium (CVSS 5.3) NULL Pointer Dereference vulnerability in linux. EPSS estimates a 1.03% chance of exploitation in the next 30 days, higher than 63.6% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 5.3, network access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
5.3/10
010
Medium · v3.1 (CVE.org)
EPSS score
1.03%
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 12 · Related 5
RHSA-2024:11313RHSA-2024:6993RHSA-2024:7000RHSA-2024:7001RHSA-2024:8613RHSA-2024:8614

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: (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]

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

1.03%

Chance of exploitation in the next 30 days

Percentile

64%

Versus all other CVEs

30-day change

No change 0.00 pp

From 1.03% 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: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu88 products
  • linuxAll versions (No fix recorded) | < 5.4.0-91.102
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 5.4.0-1060.63
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ cf48d17623281c2b3185030ed23f148bd47e15de, < 6cb01fe630eaffc5a2c3f7364436caddba286623 | ≥ cf48d17623281c2b3185030ed23f148bd47e15de, < 7c4fd5de39f273626a2b0f3a446d2cc85cd47616 | ≥ cf48d17623281c2b3185030ed23f148bd47e15de, < 746011193f44f97f8784edcf8327c587946745fc | ≥ cf48d17623281c2b3185030ed23f148bd47e15de, < dd4d747ef05addab887dc8ff0d6ab9860bbcd783 | 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

8 links