CVE-2026-20507: CWE-416 Use After Free in MediaTek, Inc. MediaTek chipset

This vulnerability (CVE-2026-20507) involves a use-after-free condition in the Audio HAL of MediaTek chipsets, which can lead to escalation of privilege locally. An attacker must already have System privilege to exploit this flaw, and no user interaction is required. The issue is tracked under Patch ID ALPS11191981 and Issue ID MSV-9125. The CVSS 3.1 vector is AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H, reflecting local attack vector, low attack complexity, high privileges required, no user interaction, unchanged scope, and high impact on confidentiality, integrity, and availability.

Successful exploitation allows an attacker with existing System privileges to escalate their privileges further, potentially gaining higher control over the affected device. The vulnerability impacts confidentiality, integrity, and availability at a high level. However, since the attacker must already have System privileges, the initial access vector is limited.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. The issue is tracked with Patch ID ALPS11191981, but no explicit patch link or official fix confirmation is provided in the available data. Users and administrators should monitor MediaTek advisories for updates and apply patches once available.