CVE-2022-40136

SMM memory disclosure via out-of-bounds SMI read

Published Jan 30, 2023 · Updated Mar 27, 2025

Out-of-bounds read in the WMI SMI Handler in Lenovo BIOS allows local users with elevated privileges to read SMM memory. The firmware handler services WMI requests for platform settings and reads beyond an intended memory boundary into SMM memory. Exploitation requires local access and elevated privileges; the disclosed data is limited to SMM memory, with no integrity or availability impact.

CVSS severity4.4
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

Out-of-bounds read in the WMI SMI Handler in Lenovo BIOS allows local users with elevated privileges to read SMM memory. The firmware handler services WMI requests for platform settings and reads beyond an intended memory boundary into SMM memory. Exploitation requires local access and elevated privileges; the disclosed data is limited to SMM memory, with no integrity or availability impact.

The record

CVE
CVE-2022-40136
Published
Jan 30, 2023
Updated
Mar 27, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-125, T1005
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Jan 30, 2023CVE publishedPublication date reported by the CVE source.
  2. Mar 27, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

4.4Lenovo Group Ltd.CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N

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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-125Out-of-bounds Read
T1005Data from Local System

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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