CVE-2026-20511: CWE-416 Use After Free in MediaTek, Inc. MediaTek chipset
Description
CVE-2026-20511 is a use-after-free vulnerability in the SurfaceFlinger component of MediaTek chipsets. It can cause memory corruption and potentially allow local privilege escalation if the attacker already has System privileges. Exploitation does not require user interaction. The vulnerability affects specific MediaTek chipset models MT6858, MT6881, MT6993, and MT8668. The CVSS score is 6.7, indicating a medium severity level.
CVSS v3.1
Score 6.7medium
Affected software
MediaTek, Inc.
MediaTek chipset
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability involves a use-after-free condition in SurfaceFlinger on MediaTek chipsets, leading to possible memory corruption. An attacker with existing System privileges could exploit this flaw to escalate privileges locally. No user interaction is required for exploitation. The affected chipsets are MT6858, MT6881, MT6993, and MT8668. The issue is tracked as MSV-8890 and patched under Patch ID ALPS11123860, though no explicit patch link is provided.
Potential Impact
Successful exploitation can result in local escalation of privilege, allowing an attacker with System-level access to gain higher privileges. The vulnerability also impacts confidentiality, integrity, and availability as indicated by the CVSS vector (C:H/I:H/A:H). However, exploitation requires the attacker to already have System privileges, limiting the initial attack surface.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. The provided data references a patch ID (ALPS11123860) but does not confirm availability or distribution of a fix. Until an official patch is confirmed, monitor vendor advisories for updates.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- MediaTek
- Date Reserved
- 2025-11-03T01:30:59.030Z
- State
- PUBLISHED
Threat ID: 6a9e1c75acd9273b49c51dc5
Added to database: 09/07/2026, 02:07:49 UTC
Last enriched: 09/15/2026, 01:21:20 UTC
Last updated: 10/21/2026, 13:20:20 UTC
Views: 113
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