Local privilege escalation via trusted_mem arbitrary write
Published Aug 3, 2026 · Updated Aug 3, 2026
Write-what-where in trusted_mem on affected MediaTek chipsets allows local users with System privilege to escalate privileges. The trusted_mem component improperly validates input, creating a write-what-where condition that writes an attacker-controlled value to an attacker-controlled location. Exploitation requires existing System privilege and user interaction; MT8186, MT8188, MT8195, MT8365, MT8370, MT8371, MT8390, MT8391, and MT8395 are affected.
Summary
What happened
Write-what-where in trusted_mem on affected MediaTek chipsets allows local users with System privilege to escalate privileges. The trusted_mem component improperly validates input, creating a write-what-where condition that writes an attacker-controlled value to an attacker-controlled location. Exploitation requires existing System privilege and user interaction; MT8186, MT8188, MT8195, MT8365, MT8370, MT8371, MT8390, MT8391, and MT8395 are affected.
The record
- CVE
- CVE-2026-20469
- Published
- Aug 3, 2026
- Updated
- Aug 3, 2026
- Vendor
- MediaTek
- Product
- MediaTek Chipset
- Classifications
- CWE-123, T1068
- Attack vector
- local
- Privileges
- admin
Timeline
How it unfolded
- Aug 3, 2026CVE publishedPublication date reported by the CVE source.
- Aug 3, 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=MT8186
- Affected versionversion=MT8188
- Affected versionversion=MT8195
- Affected versionversion=MT8365
- Affected versionversion=MT8370
- Affected versionversion=MT8371
- Affected versionversion=MT8390
- Affected versionversion=MT8391
- Affected versionversion=MT8395
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
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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