CVE-2026-31486

Local state corruption via unsynchronized regulator operations

Published Apr 22, 2026 · Updated Apr 22, 2026

Race condition in Linux Kernel PMBus core allows local users to corrupt regulator state and interrupt service through local access. The pmbus_regulator_get_voltage(), pmbus_regulator_set_voltage(), and pmbus_regulator_list_voltage() paths access PMBus registers and shared data without holding update_lock. Exploitation requires low-privileged local access and a configured PMBus regulator path; concurrent operations expose inconsistent voltage state or system interruption.

CVSS severity7.1
High
EPSS probability0.10%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Race condition in Linux Kernel PMBus core allows local users to corrupt regulator state and interrupt service through local access. The pmbus_regulator_get_voltage(), pmbus_regulator_set_voltage(), and pmbus_regulator_list_voltage() paths access PMBus registers and shared data without holding update_lock. Exploitation requires low-privileged local access and a configured PMBus regulator path; concurrent operations expose inconsistent voltage state or system interruption.

The record

CVE
CVE-2026-31486
Published
Apr 22, 2026
Updated
Apr 22, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-667, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 22, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 22, 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=3.19
  2. Affected versionversion=ddbb4db4ced1ba784fcd3500179a7291b6c5d7b7 <2c77ae315f3ce9d2c8e1609be74c9358c1fe4e07
  3. Affected versionversion=ddbb4db4ced1ba784fcd3500179a7291b6c5d7b7 <4e9d723d9f198b86f6882a84c501ba1f39e8d055
  4. Affected versionversion=ddbb4db4ced1ba784fcd3500179a7291b6c5d7b7 <754bd2b4a084b90b5e7b630e1f423061a9b9b761

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=3.19; version=ddbb4db4ced1ba784fcd3500179a7291b6c5d7b7 <2c77ae315f3ce9d2c8e1609be74c9358c1fe4e07; version=ddbb4db4ced1ba784fcd3500179a7291b6c5d7b7 <4e9d723d9f198b86f6882a84c501ba1f39e8d055; version=ddbb4db4ced1ba784fcd3500179a7291b6c5d7b7 <754bd2b4a084b90b5e7b630e1f423061a9b9b761

Published CVSS scores

7.1LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/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.

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

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-667Improper Locking
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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