CVE-2021-47385

Kernel crash via triggering w83792d sensor value

Published May 21, 2024 · Updated May 11, 2026

NULL pointer dereference in the Linux kernel's w83792d hardware-monitoring driver allows local users to crash the kernel via sensor input. The driver retains and dereferences an lm75[] entry that became unnecessary after migration to devm_i2c_new_dummy_device() when a device returns the triggering bit pattern. Reachability requires local low-privileged access and a w83792d-managed device returning that pattern; the reported consequence is an availability-only kernel crash.

CVSS severity5.5
Medium
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in the Linux kernel's w83792d hardware-monitoring driver allows local users to crash the kernel via sensor input. The driver retains and dereferences an lm75[] entry that became unnecessary after migration to devm_i2c_new_dummy_device() when a device returns the triggering bit pattern. Reachability requires local low-privileged access and a w83792d-managed device returning that pattern; the reported consequence is an availability-only kernel crash.

The record

CVE
CVE-2021-47385
Published
May 21, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-476, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 21, 2024CVE publishedPublication date reported by the CVE source.
  2. May 11, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=5.4
  2. Affected versionversion=f64211151db4269341ee6432ce832ae3756725ad <0f36b88173f028e372668ae040ab1a496834d278
  3. Affected versionversion=f64211151db4269341ee6432ce832ae3756725ad <1499bb2c3a87a2efea0065adab2bd66badee61c3
  4. Affected versionversion=f64211151db4269341ee6432ce832ae3756725ad <200ced5ba724d8bbf29dfac4ed1e17a39ccaccd1
  5. Affected versionversion=f64211151db4269341ee6432ce832ae3756725ad <24af1fe376e22c42238a4a604d31e46c486876c3

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.4; version=f64211151db4269341ee6432ce832ae3756725ad <0f36b88173f028e372668ae040ab1a496834d278; version=f64211151db4269341ee6432ce832ae3756725ad <1499bb2c3a87a2efea0065adab2bd66badee61c3; version=f64211151db4269341ee6432ce832ae3756725ad <200ced5ba724d8bbf29dfac4ed1e17a39ccaccd1; version=f64211151db4269341ee6432ce832ae3756725ad <24af1fe376e22c42238a4a604d31e46c486876c3

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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