CVE-2025-37768

Service interruption via overflowing fan-speed divisor

Published May 1, 2025 · Updated May 11, 2026

Divide-by-zero in affected Linux kernel releases since 4.20 allows local users to interrupt service by setting an excessive AMD GPU fan speed. The smu7_fan_ctrl_set_fan_speed_rpm function multiplies the untrusted speed by eight in a 32-bit divisor, allowing wraparound to zero before calculating the tachometer period. The path requires local low-privileged access and compatible AMD GPU hardware; no confidentiality or integrity impact is reported.

CVSS severity5.5
Medium
EPSS probability0.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Divide-by-zero in affected Linux kernel releases since 4.20 allows local users to interrupt service by setting an excessive AMD GPU fan speed. The smu7_fan_ctrl_set_fan_speed_rpm function multiplies the untrusted speed by eight in a 32-bit divisor, allowing wraparound to zero before calculating the tachometer period. The path requires local low-privileged access and compatible AMD GPU hardware; no confidentiality or integrity impact is reported.

The record

CVE
CVE-2025-37768
Published
May 1, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-369, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 1, 2025CVE 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=4.20
  2. Affected versionversion=c52dcf49195d06319189c7f1dd8b62bfca545197 <3cdd02cb70682d7d205ca6dc02a4d1eb76758d24
  3. Affected versionversion=c52dcf49195d06319189c7f1dd8b62bfca545197 <5fc4fb54f6f064c25bfbbfd443aa861d3422dd4c
  4. Affected versionversion=c52dcf49195d06319189c7f1dd8b62bfca545197 <7c246a05df51c52fe0852ce56ba10c41e6ed1f39
  5. Affected versionversion=c52dcf49195d06319189c7f1dd8b62bfca545197 <8e9c4f8d197d5709c75effa5d58e80b4fa01981a
  6. Affected versionversion=c52dcf49195d06319189c7f1dd8b62bfca545197 <9e4f1e21fe7b93a8ef57db433071266c2590e260
  7. Affected versionversion=c52dcf49195d06319189c7f1dd8b62bfca545197 <b0742a709be7979c7a480772046a1f36d09dab00
  8. Affected versionversion=c52dcf49195d06319189c7f1dd8b62bfca545197 <be0fffc4152aac4f0291ed2d793f3cfee788449d

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.20; version=c52dcf49195d06319189c7f1dd8b62bfca545197 <3cdd02cb70682d7d205ca6dc02a4d1eb76758d24; version=c52dcf49195d06319189c7f1dd8b62bfca545197 <5fc4fb54f6f064c25bfbbfd443aa861d3422dd4c; version=c52dcf49195d06319189c7f1dd8b62bfca545197 <7c246a05df51c52fe0852ce56ba10c41e6ed1f39; version=c52dcf49195d06319189c7f1dd8b62bfca545197 <8e9c4f8d197d5709c75effa5d58e80b4fa01981a; version=c52dcf49195d06319189c7f1dd8b62bfca545197 <9e4f1e21fe7b93a8ef57db433071266c2590e260; version=c52dcf49195d06319189c7f1dd8b62bfca545197 <b0742a709be7979c7a480772046a1f36d09dab00; version=c52dcf49195d06319189c7f1dd8b62bfca545197 <be0fffc4152aac4f0291ed2d793f3cfee788449d

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

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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-369Divide By Zero
T1499.004Endpoint Denial of Service: Application or System Exploitation

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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