CVE-2022-35896Public exploit

SMRAM disclosure via unchecked SMI source address

Published Sep 21, 2022 · Updated May 5, 2025

Improper input validation in InsydeH2O kernels 5.0 through 5.5 allows local users to read SMRAM through a software SMI. The FvbServicesRuntimeDxe handler accepts an attacker-controlled source address without checking whether it points into SMRAM, then copies bytes from that address into the communication buffer. Kernel-level access is required; the primitive discloses protected firmware memory but does not itself modify SMRAM or execute code.

CVSS severity6.0
Medium
EPSS probability0.31%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper input validation in InsydeH2O kernels 5.0 through 5.5 allows local users to read SMRAM through a software SMI. The FvbServicesRuntimeDxe handler accepts an attacker-controlled source address without checking whether it points into SMRAM, then copies bytes from that address into the communication buffer. Kernel-level access is required; the primitive discloses protected firmware memory but does not itself modify SMRAM or execute code.

The record

CVE
CVE-2022-35896
Published
Sep 21, 2022
Updated
May 5, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-20
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Sep 21, 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

6.0BinarlyCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N
6.0Insyde SoftwareCVSS: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
6.0NIST NVDCVSS: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.

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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-20Improper Input Validation

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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