SMM code execution via out-of-bounds write
Published Jul 16, 2026 · Updated Jul 16, 2026
Out-of-bounds write in Lenovo laptop BIOS firmware allows local users with administrative privileges to execute code in System Management Mode. Lenovo has not disclosed the affected SMM handler, the attacker-controlled input, or the operation that writes beyond its intended buffer. Administrative access and local execution are required; successful exploitation runs attacker-controlled code at the firmware's SMM privilege level.
Summary
What happened
Out-of-bounds write in Lenovo laptop BIOS firmware allows local users with administrative privileges to execute code in System Management Mode. Lenovo has not disclosed the affected SMM handler, the attacker-controlled input, or the operation that writes beyond its intended buffer. Administrative access and local execution are required; successful exploitation runs attacker-controlled code at the firmware's SMM privilege level.
The record
- CVE
- CVE-2026-10589
- Published
- Jul 16, 2026
- Updated
- Jul 16, 2026
- Vendor
- Lenovo
- Product
- ThinkBook Plus G5 Tab+ThinkBook Plus G5 Station BIOS
- Classifications
- CWE-787, T1068
- Attack vector
- local
- Privileges
- admin
Timeline
How it unfolded
- Jul 16, 2026CVE publishedPublication date reported by the CVE source.
- Jul 16, 2026Record 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=0 <=P8CN42WW
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.
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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