Local denial of service via unchecked WLAN write
Published Jun 1, 2026 · Updated Jun 1, 2026
Out-of-bounds write in MediaTek chipset WLAN STA drivers allows local users to crash systems through a missing bounds check. The driver writes beyond an intended buffer because it fails to validate a boundary, but MediaTek has not disclosed the affected function or input field. Low-privilege user execution is required, no user interaction is needed, and the bounded reported consequence is a system crash.
Summary
What happened
Out-of-bounds write in MediaTek chipset WLAN STA drivers allows local users to crash systems through a missing bounds check. The driver writes beyond an intended buffer because it fails to validate a boundary, but MediaTek has not disclosed the affected function or input field. Low-privilege user execution is required, no user interaction is needed, and the bounded reported consequence is a system crash.
The record
- CVE
- CVE-2026-20456
- Published
- Jun 1, 2026
- Updated
- Jun 1, 2026
- Vendor
- MediaTek
- Product
- MediaTek Chipset
- Classifications
- CWE-787, T1499.004
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Jun 1, 2026CVE publishedPublication date reported by the CVE source.
- Jun 1, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
Compare your product and version with the public record. A matching version still requires validation against your environment.
Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=MT7902
- Affected versionversion=MT7920
- Affected versionversion=MT7921
- Affected versionversion=MT7922
- Affected versionversion=MT7925
- Affected versionversion=MT7927
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.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
Check the software in your environment
Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.
Book a demo