MediaTek October 2026 Bulletin Fixes 31 Chipset Vulnerabilities
Tech GuruQuick Answer
MediaTek's October 2026 bulletin addresses 31 vulnerabilities, including two Critical modem flaws. The authority provides no numeric CVSS base scores and no universal fixed build. Device owners should map models to MediaTek chipsets with their OEM and deploy the OEM-approved update that incorporates MediaTek's October patches.
Map Device Models To Chipsets And Obtain OEM Updates
What to do now: Inventory devices using MediaTek components, obtain authoritative model-to-chipset and patch-status confirmation from each OEM, prioritize the Critical modem findings, deploy OEM-approved updates, validate cellular and media functions, and retain mapping and change evidence.
Last verified: 2026-10-05 UTC. Recheck the authoritative advisory and supported distribution channel before changing production.
Scope And Authority
| Product scope | MediaTek modem, video, APU, display, connectivity, trusted-execution, and related chipset components listed in the October 2026 bulletin |
|---|---|
| Advisory | MediaTek October 2026 Product Security Bulletin |
| CVEs | CVE-2026-20519, CVE-2026-20520, CVE-2026-20521, CVE-2026-20522, CVE-2026-20523, CVE-2026-20524, CVE-2026-20525, CVE-2026-20526, CVE-2026-20527, CVE-2026-20528, CVE-2026-20529, CVE-2026-20530, CVE-2026-20531, CVE-2026-20532, CVE-2026-20533, CVE-2026-20534, CVE-2026-20535, CVE-2026-20536, CVE-2026-20537, CVE-2026-20538, CVE-2026-20539, CVE-2026-20540, CVE-2026-20541, CVE-2026-20542, CVE-2026-20543, CVE-2026-20544, CVE-2026-20579, CVE-2026-20586, CVE-2026-20587, CVE-2026-20588, CVE-2026-20589 |
| Authoritative release date | 2026-10-05 (calendar date; exact publication time not provided) |
| Authority revision date | Version 1.0 published 2026-10-05; no later revision stated |
| Affected versions | The MediaTek chipset and component combinations listed in the bulletin's CVE tables; MediaTek states that the affected-chipset list may be incomplete, so device-model applicability must be confirmed with the OEM. |
| Fixed version | OEM-supplied security updates incorporating MediaTek's October 2026 patches; no universal public fixed build is stated |
| CVSS base score | Not provided by the authority |
| CVSS severity | Critical (highest official severity; 2 Critical, 9 High, 20 Medium) |
| Exploitation status | MediaTek states that it is not aware of active exploitation; no exploitation claim is inferred. |
What Changed
MediaTek published fixes for 31 vulnerabilities across chipset components. Two modem flaws are rated Critical; the remaining issues are rated High or Medium. MediaTek supplied patches to OEMs at least two months before publication and states that it is not aware of active exploitation.
What To Validate Now
- Inventory. Record device model, OEM, chipset or bill-of-materials evidence, Android or firmware build, carrier or management channel, owner, exposure, and update eligibility.
- Establish applicability. Match the underlying chipset and component to MediaTek's CVE tables with OEM confirmation. Treat the authority's chipset lists as potentially incomplete and do not infer model applicability.
- Remediate. Install the supported OEM or carrier update that incorporates MediaTek's October 2026 patches. Do not independently flash chip-level patches or invent a universal fixed build.
- Validate. Confirm the resulting OEM build and security-patch state; test cellular, Wi-Fi, camera, media, trusted-execution, and device-management workflows relevant to the deployed model.
- Retain evidence. Preserve asset and owner identifiers, the applicability decision, before-and-after versions, change approval, installation output, validation results, and any exception or rollback record.
Operational Cautions
OEM delivery dates and build identifiers vary. Coordinate managed-device rollout, carrier requirements, recovery options, and enrollment controls; the Critical rating is not evidence of exploitation.
Evidence To Retain
- Exact product, release stream, package or application version, enabled feature, environment, and accountable owner.
- UTC timestamps, authority revision, approved change record, installer or package-manager output, and resulting version.
- Relevant logs and monitoring evidence, test results, exceptions, compensating controls, and rollback decisions.
Related TechGeeks Resources
Authoritative References
Correction policy: If the authority changes affected versions, fixed versions, severity, exploitation information, mitigations, or required action, TechGeeks will update this notice and its verification date.
