SMRAM disclosure to privileged local users
Published Jul 30, 2025 · Updated Aug 14, 2025
Information disclosure in SetupAutomationSmm in InsydeH2O before L05.05.40.011803.172079 allows local users to read SMRAM contents. Public advisories identify the affected SMM module and an SMRAM read but do not disclose the faulty operation that returns protected memory. Exploitation requires privileged local access to an affected Lenovo all-in-one system, and no network-reachable path is reported.
Summary
What happened
Information disclosure in SetupAutomationSmm in InsydeH2O before L05.05.40.011803.172079 allows local users to read SMRAM contents. Public advisories identify the affected SMM module and an SMRAM read but do not disclose the faulty operation that returns protected memory. Exploitation requires privileged local access to an affected Lenovo all-in-one system, and no network-reachable path is reported.
The record
- CVE
- CVE-2025-4426
- Published
- Jul 30, 2025
- Updated
- Aug 14, 2025
- Vendor
- Insyde Software
- Product
- InsydeH2O UEFI BIOS
- Classifications
- CWE-200, T1068
- Attack vector
- local
- Privileges
- admin
Timeline
How it unfolded
- Jul 30, 2025CVE publishedPublication date reported by the CVE source.
- Aug 14, 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?
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- Affected versionversion=Feature developed for Lenovo <L05.05.40.011803.172079
What conditions does exploitation require?
What is affected?
Published CVSS scores
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.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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