CVE-2021-47098

Incorrect sensor hysteresis via unclamped arithmetic

Published Mar 4, 2024 · Updated May 11, 2026

Integer overflow in Linux 5.14 through 5.15.11 allows local users to corrupt lm90 hysteresis calculations through a sysfs write. The lm90 hysteresis store path subtracts an unbounded MAX_LONG value from a negative critical-temperature limit without first clamping the input, causing signed arithmetic to wrap before the hardware register value is derived. Standard writable hwmon attributes require privileged access; public sources do not identify a resulting crash, disclosure, or code-execution path.

CVSS severity7.8
High
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Integer overflow in Linux 5.14 through 5.15.11 allows local users to corrupt lm90 hysteresis calculations through a sysfs write. The lm90 hysteresis store path subtracts an unbounded MAX_LONG value from a negative critical-temperature limit without first clamping the input, causing signed arithmetic to wrap before the hardware register value is derived. Standard writable hwmon attributes require privileged access; public sources do not identify a resulting crash, disclosure, or code-execution path.

The record

CVE
CVE-2021-47098
Published
Mar 4, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-190
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 4, 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=5.14
  2. Affected versionversion=b50aa49638c7e12abf4ecc483f4e928c5cccc1b0 <55840b9eae5367b5d5b29619dc2fb7e4596dba46
  3. Affected versionversion=b50aa49638c7e12abf4ecc483f4e928c5cccc1b0 <d105f30bea9104c590a9e5b495cb8a49bdfe405f

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.14; version=b50aa49638c7e12abf4ecc483f4e928c5cccc1b0 <55840b9eae5367b5d5b29619dc2fb7e4596dba46; version=b50aa49638c7e12abf4ecc483f4e928c5cccc1b0 <d105f30bea9104c590a9e5b495cb8a49bdfe405f

Published CVSS scores

7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8UbuntuCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-190Integer Overflow or Wraparound

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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