Physical denial of service via secure-boot integer overflow
Published Apr 7, 2026 · Updated Apr 7, 2026
Out-of-bounds write in MediaTek Chipset MT6813 secure boot allows physically proximate attackers with user privileges to interrupt service. The secure-boot component performs an undisclosed integer calculation that can overflow and use the resulting value to write outside the intended memory bounds. Physical access and user execution privileges are required; no user interaction is needed, and the documented consequence is availability loss without reported data exposure or modification.
Summary
What happened
Out-of-bounds write in MediaTek Chipset MT6813 secure boot allows physically proximate attackers with user privileges to interrupt service. The secure-boot component performs an undisclosed integer calculation that can overflow and use the resulting value to write outside the intended memory bounds. Physical access and user execution privileges are required; no user interaction is needed, and the documented consequence is availability loss without reported data exposure or modification.
The record
- CVE
- CVE-2026-20446
- Published
- Apr 7, 2026
- Updated
- Apr 7, 2026
- Vendor
- MediaTek
- Product
- MediaTek Chipset
- Classifications
- CWE-190, CWE-787, T1499.004
- Attack vector
- physical
- Privileges
- authenticated
Timeline
How it unfolded
- Apr 7, 2026CVE publishedPublication date reported by the CVE source.
- Apr 7, 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=MT6813
What conditions does exploitation require?
What is affected?
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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