CVE-2026-20456: CWE-787 Out-of-bounds Write in MediaTek, Inc. MediaTek chipset
CVE-2026-20456 is a medium severity vulnerability in MediaTek chipsets MT7902, MT7920, MT7921, MT7922, MT7925, and MT7927. It involves an out-of-bounds write in the wlan STA driver caused by a missing bounds check, which can lead to a system crash. Exploitation requires user-level privileges but no user interaction. The vulnerability results in a local denial of service condition. No patch or official remediation has been confirmed yet.
AI Analysis
Technical Summary
This vulnerability (CVE-2026-20456) affects several MediaTek chipset models through an out-of-bounds write in the wlan STA driver due to a missing bounds check. The flaw can cause a system crash, leading to denial of service. Exploitation requires local user privileges but does not require user interaction. The CVSS 3.1 base score is 5.5, reflecting medium severity with an attack vector of local access, low attack complexity, and no confidentiality or integrity impact, only availability impact. No vendor advisory or patch information is currently available to confirm remediation status.
Potential Impact
Successful exploitation causes a local denial of service by crashing the system. There is no impact on confidentiality or integrity. The attacker needs local user privileges but does not require user interaction to trigger the vulnerability. There are no known exploits in the wild at this time.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a patch or official fix is released by MediaTek, users should limit local access to trusted users and monitor for updates from the vendor regarding this issue.
CVE-2026-20456: CWE-787 Out-of-bounds Write in MediaTek, Inc. MediaTek chipset
Description
CVE-2026-20456 is a medium severity vulnerability in MediaTek chipsets MT7902, MT7920, MT7921, MT7922, MT7925, and MT7927. It involves an out-of-bounds write in the wlan STA driver caused by a missing bounds check, which can lead to a system crash. Exploitation requires user-level privileges but no user interaction. The vulnerability results in a local denial of service condition. No patch or official remediation has been confirmed yet.
CVSS v3.1
Score 5.5medium
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-20456) affects several MediaTek chipset models through an out-of-bounds write in the wlan STA driver due to a missing bounds check. The flaw can cause a system crash, leading to denial of service. Exploitation requires local user privileges but does not require user interaction. The CVSS 3.1 base score is 5.5, reflecting medium severity with an attack vector of local access, low attack complexity, and no confidentiality or integrity impact, only availability impact. No vendor advisory or patch information is currently available to confirm remediation status.
Potential Impact
Successful exploitation causes a local denial of service by crashing the system. There is no impact on confidentiality or integrity. The attacker needs local user privileges but does not require user interaction to trigger the vulnerability. There are no known exploits in the wild at this time.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a patch or official fix is released by MediaTek, users should limit local access to trusted users and monitor for updates from the vendor regarding this issue.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- MediaTek
- Date Reserved
- 2025-11-03T01:30:59.014Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a1d8336e29bf47b50f6ae51
Added to database: 6/1/2026, 1:03:50 PM
Last enriched: 6/1/2026, 1:19:11 PM
Last updated: 6/1/2026, 6:06:22 PM
Views: 6
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