CVE-2022-30283

SMRAM corruption via DMA TOCTOU race

Published Nov 15, 2022 · Updated Apr 30, 2025

Time-of-check time-of-use race condition in Insyde InsydeH2O Kernel before fixed builds allows local users to escalate privileges via DMA tampering. UsbCoreDxe processes a USB transaction buffer outside SMRAM while SMM code consumes it, and pointer validation continues when an address is absent from the sanitization list, allowing a DMA change between check and use to corrupt SMRAM. Exploitation requires high local privileges and control of a DMA-capable device during an active USB transaction; resulting impact includes privilege escalation and firmware memory corruption.

CVSS severity7.5
High
EPSS probability0.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Time-of-check time-of-use race condition in Insyde InsydeH2O Kernel before fixed builds allows local users to escalate privileges via DMA tampering. UsbCoreDxe processes a USB transaction buffer outside SMRAM while SMM code consumes it, and pointer validation continues when an address is absent from the sanitization list, allowing a DMA change between check and use to corrupt SMRAM. Exploitation requires high local privileges and control of a DMA-capable device during an active USB transaction; resulting impact includes privilege escalation and firmware memory corruption.

The record

CVE
CVE-2022-30283
Published
Nov 15, 2022
Updated
Apr 30, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-367, T1068
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

7.5NVDCVSS: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-367Time-of-check Time-of-use (TOCTOU) Race Condition
T1068Exploitation for Privilege Escalation

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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