CVE-2022-29279

Privileged SMRAM tampering via untrusted pointer

Published Nov 15, 2022 · Updated Apr 30, 2025

Improper memory handling in InsydeH2O Kernel 5.0 through 5.5 allows local users with high privileges to tamper with SMRAM and OS memory. SdHostDriver and SdMmcDevice use an untrusted pointer without sufficient bounds validation, allowing attacker-controlled addresses to alter firmware or operating-system memory. Exploitation requires privileged local access and can compromise confidentiality, integrity, and availability across the firmware trust boundary.

CVSS severity8.2
High
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

Improper memory handling in InsydeH2O Kernel 5.0 through 5.5 allows local users with high privileges to tamper with SMRAM and OS memory. SdHostDriver and SdMmcDevice use an untrusted pointer without sufficient bounds validation, allowing attacker-controlled addresses to alter firmware or operating-system memory. Exploitation requires privileged local access and can compromise confidentiality, integrity, and availability across the firmware trust boundary.

The record

CVE
CVE-2022-29279
Published
Nov 15, 2022
Updated
Apr 30, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-119, T1542.001
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Nov 15, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 30, 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

8.2NVDCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
7.5InsydeCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer
T1542.001Pre-OS Boot: System Firmware

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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