CVE-2026-20478: CWE-787 Out-of-bounds Write in MediaTek, Inc. MediaTek chipset
CVE-2026-20478 is an out-of-bounds write vulnerability in the Audio HAL component of MediaTek chipsets. It results from a heap buffer overflow and can cause a local denial of service. Exploitation requires user-level privileges but does not need user interaction. The issue affects specific MediaTek chipset models including MT2735, MT2737, MT6880, MT6890, MT6988, and MT6990. No official patch or remediation level has been confirmed yet.
AI Analysis
Technical Summary
This vulnerability (CVE-2026-20478) involves a heap buffer overflow in the Audio HAL of certain MediaTek chipsets, leading to an out-of-bounds write. The flaw allows an attacker with local user privileges to cause a denial of service condition without requiring user interaction. The affected chipsets are MT2735, MT2737, MT6880, MT6890, MT6988, and MT6990. Patch identifiers ALPS10981454 and AUTO00851293 are referenced for different chipset models, but no explicit patch availability or remediation level is confirmed in the vendor advisory data.
Potential Impact
Successful exploitation results in a local denial of service, impacting availability. No confidentiality or integrity impacts are reported. The attack requires local user privileges but no user interaction.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Monitor MediaTek advisories for updates regarding patches identified by ALPS10981454 and AUTO00851293. Until an official fix is released, restrict local user access where possible to mitigate risk.
CVE-2026-20478: CWE-787 Out-of-bounds Write in MediaTek, Inc. MediaTek chipset
Description
CVE-2026-20478 is an out-of-bounds write vulnerability in the Audio HAL component of MediaTek chipsets. It results from a heap buffer overflow and can cause a local denial of service. Exploitation requires user-level privileges but does not need user interaction. The issue affects specific MediaTek chipset models including MT2735, MT2737, MT6880, MT6890, MT6988, and MT6990. No official patch or remediation level has been confirmed yet.
CVSS v3.1
Score 5.5medium
Affected software
MediaTek, Inc.
MediaTek chipset
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-20478) involves a heap buffer overflow in the Audio HAL of certain MediaTek chipsets, leading to an out-of-bounds write. The flaw allows an attacker with local user privileges to cause a denial of service condition without requiring user interaction. The affected chipsets are MT2735, MT2737, MT6880, MT6890, MT6988, and MT6990. Patch identifiers ALPS10981454 and AUTO00851293 are referenced for different chipset models, but no explicit patch availability or remediation level is confirmed in the vendor advisory data.
Potential Impact
Successful exploitation results in a local denial of service, impacting availability. No confidentiality or integrity impacts are reported. The attack requires local user privileges but no user interaction.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Monitor MediaTek advisories for updates regarding patches identified by ALPS10981454 and AUTO00851293. Until an official fix is released, restrict local user access where possible to mitigate risk.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- MediaTek
- Date Reserved
- 2025-11-03T01:30:59.021Z
- State
- PUBLISHED
Threat ID: 6a700183bf32cb7a34d5caa0
Added to database: 08/03/2026, 02:48:35 UTC
Last enriched: 08/10/2026, 15:00:34 UTC
Last updated: 09/14/2026, 22:01:32 UTC
Views: 29
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