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MediaTek vdec CVE-2026-20501

| EUVDEUVD-2026-72194 HIGH
Heap-based Buffer Overflow (CWE-122)
2026-09-07 MediaTek GHSA-fmxm-vg76-2r5p
8.4
CVSS 3.1 · Vendor: MediaTek
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Vendor (MediaTek) PRIMARY
8.4 HIGH
AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
vuln.today AI
8.4 HIGH

Local kernel driver reachable from unprivileged app sandbox (AV:L, PR:N); low-complexity heap overflow yields full kernel control (C/I/A:H); scope unchanged as compromise stays within the affected device boundary.

3.1 AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
4.0 AV:L/AC:L/AT:N/PR:N/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
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

3
Analysis Generated
Sep 07, 2026 - 11:34 vuln.today
CVE Published
Sep 07, 2026 - 01:57 cve.org
HIGH 8.4
CVE Published
Sep 07, 2026 - 01:57 cve.org
UNKNOWN (no severity yet)

DescriptionCVE.org

In vdec, there is a possible out of bounds write due to a heap buffer overflow. This could lead to local escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation. Patch ID: ALPS11262030; Issue ID: MSV-9197.

AnalysisAI

Heap buffer overflow in the vdec (video decoder) kernel driver across 53+ MediaTek SoCs allows a local unprivileged attacker to escalate privileges to kernel level with full system compromise. The CVSS vector (AV:L/AC:L/PR:N/UI:N) reflects that any Android app running on an affected device can trigger this flaw without special permissions or user interaction, consistent with typical Android kernel driver exposure. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Recon
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Delivery
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Exploit
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Install
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C2
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Execute
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Impact
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Vulnerability AssessmentAI

Exploitation Exploitation requires local code execution on the device - specifically, a malicious or compromised Android application running on a device with an affected MediaTek chipset. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 8.4 vector (AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H) accurately reflects the local, low-complexity, zero-privilege nature of this Android kernel driver attack. … 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 OEMs shipping devices with affected MediaTek chipsets should integrate the upstream fix under Patch ID ALPS11262030 (Issue MSV-9197) from the MediaTek September 2026 Product Security Bulletin (https://www.mediatek.com/product-security-bulletin/September-2026) and issue device security updates promptly. … Detailed patch versions, workarounds, and compensating controls in full report.

Recommended ActionAI

Within 24 hours, identify all devices using affected MediaTek SoCs in your inventory by cross-referencing device models against the CVE's 53+ SoC list and prioritize by data sensitivity. …

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

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CVE-2026-20501 vulnerability details – vuln.today

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