CVE-2026-20521: CWE-121 Stack-based Buffer Overflow in MediaTek, Inc. MediaTek chipset
Description
CVE-2026-20521 is a stack-based buffer overflow vulnerability in the Video HAL component of MediaTek chipsets. It arises from a missing bounds check, allowing local escalation of privilege without requiring additional execution privileges or user interaction. Multiple MediaTek chipset models are affected. No CVSS score is provided, and no known exploits are reported in the wild.
Affected software
MediaTek, Inc.
MediaTek chipset
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability involves a stack-based buffer overflow (CWE-121) in the Video HAL of MediaTek chipsets due to a missing bounds check. Exploitation can lead to local privilege escalation without needing extra execution privileges or user interaction. The issue is identified by Patch ID ALPS11375674 and Issue ID MSV-9571. Affected chipset models include a broad range of MediaTek SoCs such as MT2718, MT6768, MT6769, MT6781, MT6789, MT6833, MT6835, MT6853, MT6855, MT6858, MT6877, MT6878, MT6879, MT6881, MT6883, MT6885, MT6886, MT6889, MT6893, MT6895, MT6897, MT6899, MT6983, MT6985, MT6989, MT6991, MT6993, MT8126, MT8171, MT8186, MT8188, MT8189, MT8195, MT8196, MT8367, MT8391, MT8395, MT8668, MT8676, MT8678, MT8695, MT8696, MT8781, MT8792, MT8793, MT8799, and MT8910. No patch links or vendor advisory details are provided.
Potential Impact
Successful exploitation allows a local attacker to escalate privileges on affected MediaTek chipsets without requiring additional execution privileges or user interaction. This could compromise system integrity or security on devices using these chipsets.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official patch or workaround information is provided in the available data.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- MediaTek
- Date Reserved
- 2025-11-03T01:30:59.032Z
- State
- PUBLISHED
Threat ID: 6ac309122cdf04f656a0bf91
Added to database: 10/05/2026, 02:18:58 UTC
Last enriched: 10/05/2026, 02:48:24 UTC
Last updated: 10/05/2026, 03:08:13 UTC
Views: 5
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