Local service interrupt via Audio HAL heap overflow
Published Aug 3, 2026 · Updated Aug 3, 2026
Heap buffer overflow in MediaTek Audio HAL on six chipset models allows local users to interrupt service without user interaction. The Audio HAL writes beyond a heap allocation, but MediaTek has not disclosed the affected routine, input path, or exact operation that overruns the buffer. Exploitation requires user execution privileges; the published assessment reports availability impact without data disclosure or modification.
Summary
What happened
Heap buffer overflow in MediaTek Audio HAL on six chipset models allows local users to interrupt service without user interaction. The Audio HAL writes beyond a heap allocation, but MediaTek has not disclosed the affected routine, input path, or exact operation that overruns the buffer. Exploitation requires user execution privileges; the published assessment reports availability impact without data disclosure or modification.
The record
- CVE
- CVE-2026-20478
- Published
- Aug 3, 2026
- Updated
- Aug 3, 2026
- Vendor
- MediaTek
- Product
- MediaTek Chipset
- Classifications
- CWE-787, T1499.004
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Aug 3, 2026CVE publishedPublication date reported by the CVE source.
- Aug 3, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=MT2735
- Affected versionversion=MT2737
- Affected versionversion=MT6880
- Affected versionversion=MT6890
- Affected versionversion=MT6988
- Affected versionversion=MT6990
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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