Local privilege escalation via missing bounds check
Published Jun 1, 2026 · Updated Jun 1, 2026
Out-of-bounds write in geniezone on affected MediaTek chipsets allows local users with System privilege to escalate privileges. The component writes beyond a memory boundary because a required bounds check is missing; the exact operation and target buffer are undisclosed. Exploitation requires existing System privilege and no user interaction; MediaTek has not disclosed the resulting elevated execution context.
Summary
What happened
Out-of-bounds write in geniezone on affected MediaTek chipsets allows local users with System privilege to escalate privileges. The component writes beyond a memory boundary because a required bounds check is missing; the exact operation and target buffer are undisclosed. Exploitation requires existing System privilege and no user interaction; MediaTek has not disclosed the resulting elevated execution context.
The record
- CVE
- CVE-2026-20455
- Published
- Jun 1, 2026
- Updated
- Jun 1, 2026
- Vendor
- MediaTek
- Product
- MediaTek Chipset
- Classifications
- CWE-787, T1068
- Attack vector
- local
- Privileges
- admin
Timeline
How it unfolded
- Jun 1, 2026CVE publishedPublication date reported by the CVE source.
- Jun 1, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
Compare your product and version with the public record. A matching version still requires validation against your environment.
Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=MT6739
- Affected versionversion=MT6761
- Affected versionversion=MT6765
- Affected versionversion=MT6768
- Affected versionversion=MT6781
- Affected versionversion=MT6789
- Affected versionversion=MT6835
- Affected versionversion=MT6853
- Affected versionversion=MT6855
- Affected versionversion=MT6877
- Affected versionversion=MT6878
- Affected versionversion=MT6879
- Affected versionversion=MT6883
- Affected versionversion=MT6885
- Affected versionversion=MT6886
- Affected versionversion=MT6889
- Affected versionversion=MT6893
- Affected versionversion=MT6895
- Affected versionversion=MT6897
- Affected versionversion=MT6899
- Affected versionversion=MT6983
- Affected versionversion=MT6985
- Affected versionversion=MT6989
- Affected versionversion=MT6991
- Affected versionversion=MT8673
- Affected versionversion=MT8765
- Affected versionversion=MT8766
- Affected versionversion=MT8768
- Affected versionversion=MT8781
- Affected versionversion=MT8786
- Affected versionversion=MT8788
- Affected versionversion=MT8791T
- Affected versionversion=MT8793
- Affected versionversion=MT8797
- Affected versionversion=MT8798
- Affected versionversion=MT8910
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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