CVE-2022-35894Public exploit

SMRAM disclosure via unchecked SMI source pointer

Published Sep 22, 2022 · Updated May 5, 2025

Information disclosure in InsydeH2O kernel 5.0 through 5.5 allows local users with DXE code execution to read SMRAM contents. The FwBlockServiceSmm SMI handler passes an unchecked communication-buffer address to memcpy or sub_800031CC, copying SMRAM bytes into the caller's destination. Exploitation requires attacker-controlled code during the DXE boot phase; the primitive discloses SMRAM addresses but does not itself write firmware or execute SMM code.

CVSS severity6.0
Medium
EPSS probability0.32%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in InsydeH2O kernel 5.0 through 5.5 allows local users with DXE code execution to read SMRAM contents. The FwBlockServiceSmm SMI handler passes an unchecked communication-buffer address to memcpy or sub_800031CC, copying SMRAM bytes into the caller's destination. Exploitation requires attacker-controlled code during the DXE boot phase; the primitive discloses SMRAM addresses but does not itself write firmware or execute SMM code.

The record

CVE
CVE-2022-35894
Published
Sep 22, 2022
Updated
May 5, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-401
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Sep 22, 2022CVE publishedPublication date reported by the CVE source.
  2. May 5, 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

6.0Insyde SoftwareCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N
6.0NIST NVDCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N
6.0CISA-ADPCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-401Missing Release of Memory after Effective Lifetime

Public exploit references

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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