CVE-2025-40189

Service interrupt via discarded EEPROM timeout

Published Nov 12, 2025 · Updated May 11, 2026

Uninitialized-data use in the Linux kernel 6.14 through 6.17.3 allows local users to interrupt service via lan78xx EEPROM read timeouts. The lan78xx_read_raw_eeprom fallthrough returns the LED-pin restoration status instead of a prior -ETIMEDOUT, so callers accept an empty or partial buffer as valid. Triggering the flaw requires a lan78xx device whose EEPROM read times out during driver probe or reset; published evidence establishes availability impact but no data disclosure or modification.

CVSS severity5.5
Medium
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Uninitialized-data use in the Linux kernel 6.14 through 6.17.3 allows local users to interrupt service via lan78xx EEPROM read timeouts. The lan78xx_read_raw_eeprom fallthrough returns the LED-pin restoration status instead of a prior -ETIMEDOUT, so callers accept an empty or partial buffer as valid. Triggering the flaw requires a lan78xx device whose EEPROM read times out during driver probe or reset; published evidence establishes availability impact but no data disclosure or modification.

The record

CVE
CVE-2025-40189
Published
Nov 12, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Nov 12, 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=6.14
  2. Affected versionversion=8b1b2ca83b200fa46fdfb81e80ad5fe34537e6d4 <49bdb63ff64469a6de8ea901aef123c75be9bbe7
  3. Affected versionversion=8b1b2ca83b200fa46fdfb81e80ad5fe34537e6d4 <a72a7c4f675080a324d4c2167bd2314d968279f1

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.14; version=8b1b2ca83b200fa46fdfb81e80ad5fe34537e6d4 <49bdb63ff64469a6de8ea901aef123c75be9bbe7; version=8b1b2ca83b200fa46fdfb81e80ad5fe34537e6d4 <a72a7c4f675080a324d4c2167bd2314d968279f1

Published CVSS scores

5.5Amazon LinuxCVSS: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

No sourced classifications are available.

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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