Adjacent-network system crash via modem logic error
Published Apr 7, 2026 · Updated Apr 7, 2026
Denial of service in the MediaTek Chipset modem allows remote attackers controlling a rogue base station to crash the system. MediaTek identifies a modem logic error mapped to unbounded or unthrottled resource allocation but does not disclose the affected function or input. Exploitation requires a UE with an affected chipset to connect to attacker-controlled cellular infrastructure; no privileges or user interaction are required, and the documented consequence is a system crash.
Summary
What happened
Denial of service in the MediaTek Chipset modem allows remote attackers controlling a rogue base station to crash the system. MediaTek identifies a modem logic error mapped to unbounded or unthrottled resource allocation but does not disclose the affected function or input. Exploitation requires a UE with an affected chipset to connect to attacker-controlled cellular infrastructure; no privileges or user interaction are required, and the documented consequence is a system crash.
The record
- CVE
- CVE-2026-20431
- Published
- Apr 7, 2026
- Updated
- Apr 7, 2026
- Vendor
- MediaTek
- Product
- MediaTek Chipset
- Classifications
- CWE-770, T1499
- Attack vector
- adjacent
- Privileges
- unauthenticated
Timeline
How it unfolded
- Apr 7, 2026CVE publishedPublication date reported by the CVE source.
- Apr 7, 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=MT6813
- Affected versionversion=MT6815
- Affected versionversion=MT6835
- Affected versionversion=MT6878
- Affected versionversion=MT6897
- Affected versionversion=MT6899
- Affected versionversion=MT6986
- Affected versionversion=MT6991
- Affected versionversion=MT6993
- Affected versionversion=MT8668
- Affected versionversion=MT8676
- Affected versionversion=MT8678
- Affected versionversion=MT8755
- Affected versionversion=MT8775
- Affected versionversion=MT8792
- Affected versionversion=MT8793
- Affected versionversion=MT8863
- Affected versionversion=MT8873
- Affected versionversion=MT8883
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
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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