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MediaTek Audio HAL CVE-2026-20506

| EUVDEUVD-2026-72199 MEDIUM
Use After Free (CWE-416)
2026-09-07 MediaTek GHSA-8xrw-cc98-j52m
6.7
CVSS 3.1 · Vendor: MediaTek
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Severity by source

Vendor (MediaTek) PRIMARY
6.7 MEDIUM
AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
vuln.today AI
6.7 MEDIUM

Local vector with System privilege required (PR:H); once achieved, exploitation is straightforward (AC:L) yielding full impact.

3.1 AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
4.0 AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Primary rating from Vendor (MediaTek).

CVSS VectorVendor: MediaTek

Attack Vector
Local
Attack Complexity
Low
Privileges Required
High
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

3
Analysis Generated
Sep 07, 2026 - 11:29 vuln.today
CVE Published
Sep 07, 2026 - 01:57 cve.org
MEDIUM 6.7
CVE Published
Sep 07, 2026 - 01:57 cve.org
UNKNOWN (no severity yet)

DescriptionCVE.org

In Audio HAL, there is a possible escalation of privilege due to use after free. 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: ALPS11191981; Issue ID: MSV-9126.

AnalysisAI

Privilege escalation via use-after-free in MediaTek's Android Audio Hardware Abstraction Layer (Audio HAL) affects over 65 distinct chipset families spanning mobile, tablet, and IoT SoCs. An attacker who has already obtained System-level privilege on a device running an affected MediaTek chipset can trigger the UAF condition to escalate further - gaining full control over confidentiality, integrity, and availability without any user interaction. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
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Delivery
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Exploit
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Execution
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Impact
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Vulnerability AssessmentAI

Exploitation Exploitation requires that the attacker has already obtained System-level privilege on the target device - this is not an initial-access vector and cannot be exercised from an unprivileged application context. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS base score of 6.7 correctly reflects the PR:H prerequisite - an attacker must already possess System privilege before this vulnerability is reachable, which substantially reduces the autonomous attack surface. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation Apply the MediaTek-supplied patch ALPS11191981, referenced in the September 2026 MediaTek Product Security Bulletin at https://www.mediatek.com/product-security-bulletin/September-2026. … Detailed patch versions, workarounds, and compensating controls in full report.

Threat intelligence, references, and detailed analysis are available after sign-in.

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Remote privilege escalation in the baseband modem firmware of dozens of MediaTek chipsets allows an attacker operating a

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CVE-2026-20506 vulnerability details – vuln.today

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