CVE-2026-20409: CWE-787 Out-of-bounds Write in MediaTek, Inc. MediaTek chipset
In imgsys, there is a possible out of bounds write due to a missing bounds check. This could lead to local escalation of privilege if a malicious actor has already obtained the System privilege. User interaction is not needed for exploitation. Patch ID: ALPS10363246; Issue ID: MSV-5779.
AI Analysis
Technical Summary
This vulnerability (CVE-2026-20409) is an out-of-bounds write in the imgsys component of MediaTek chipsets MT6897 and MT6989 caused by a missing bounds check. It allows a local attacker with existing System privileges to escalate their privileges further. Exploitation does not require user interaction. The CVSS 3.1 base score is 7.8 (AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H), reflecting local attack vector with low complexity, requiring some privileges, no user interaction, unchanged scope, and high impact on confidentiality, integrity, and availability. The issue is tracked internally by MediaTek as MSV-5779 and patch ID ALPS10363246. No public patch link or vendor advisory is included in the provided data.
Potential Impact
Successful exploitation could lead to local privilege escalation on affected MediaTek chipsets, potentially allowing an attacker with System privileges to gain higher privileges or execute arbitrary code with elevated rights. The vulnerability impacts confidentiality, integrity, and availability at a high level. There are no reports of active exploitation in the wild.
Mitigation Recommendations
A patch is referenced by MediaTek under patch ID ALPS10363246; however, no direct patch or vendor advisory content is provided to confirm availability. Patch status is not yet confirmed — check the official MediaTek advisory or vendor channels for current remediation guidance. Until a patch is applied, limit local access to trusted users only, as exploitation requires existing System privileges.
CVE-2026-20409: CWE-787 Out-of-bounds Write in MediaTek, Inc. MediaTek chipset
Description
In imgsys, there is a possible out of bounds write due to a missing bounds check. This could lead to local escalation of privilege if a malicious actor has already obtained the System privilege. User interaction is not needed for exploitation. Patch ID: ALPS10363246; Issue ID: MSV-5779.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-20409) is an out-of-bounds write in the imgsys component of MediaTek chipsets MT6897 and MT6989 caused by a missing bounds check. It allows a local attacker with existing System privileges to escalate their privileges further. Exploitation does not require user interaction. The CVSS 3.1 base score is 7.8 (AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H), reflecting local attack vector with low complexity, requiring some privileges, no user interaction, unchanged scope, and high impact on confidentiality, integrity, and availability. The issue is tracked internally by MediaTek as MSV-5779 and patch ID ALPS10363246. No public patch link or vendor advisory is included in the provided data.
Potential Impact
Successful exploitation could lead to local privilege escalation on affected MediaTek chipsets, potentially allowing an attacker with System privileges to gain higher privileges or execute arbitrary code with elevated rights. The vulnerability impacts confidentiality, integrity, and availability at a high level. There are no reports of active exploitation in the wild.
Mitigation Recommendations
A patch is referenced by MediaTek under patch ID ALPS10363246; however, no direct patch or vendor advisory content is provided to confirm availability. Patch status is not yet confirmed — check the official MediaTek advisory or vendor channels for current remediation guidance. Until a patch is applied, limit local access to trusted users only, as exploitation requires existing System privileges.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- MediaTek
- Date Reserved
- 2025-11-03T01:30:59.008Z
- Cvss Version
- null
- State
- PUBLISHED
Threat ID: 69806092f9fa50a62f0b3f7f
Added to database: 2/2/2026, 8:30:10 AM
Last enriched: 4/4/2026, 11:05:56 AM
Last updated: 5/10/2026, 12:27:47 AM
Views: 90
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