Security fix · CVE-2026-20456
In wlan STA driver, there is a possible system crash due to a missing bounds check.
Published Jun 1, 2026 · corrected/updated Jul 22, 2026 · mediatek mt7902 firmware · evidence confidence medium
In wlan STA driver, there is a possible system crash due to a missing bounds check. This could lead to local denial of service with User execution privileges needed. User interaction is not needed for exploitation. Patch ID: WCNCR00480851; Issue ID: MSV-6338.
Grounded briefings
Catalog interpretations for three audiences. Each brief cites ingested metadata and the original advisories below. They are not independent research and they do not invent exploit steps.
Executive
CVE-2026-20456 is a medium public vulnerability record for mediatek mt7902 firmware. It is not currently listed in the CISA Known Exploited catalog. Check the linked vendor or CERT advisories for patch status. This summary is a catalog interpretation of the ingested metadata and cites the original advisories below.
System administrator
Identify whether mediatek mt7902 firmware is in your estate, then compare installed versions with the affected ranges. Affected packages or ranges on record: mediatek/mt7902 firmware; mediatek/mt7920 firmware; mediatek/mt7921 firmware; mediatek/mt7922 firmware. Check the linked vendor or CERT advisories for patch status. Prefer the vendor or distribution advisory linked in Sources before changing production systems. This is a catalog interpretation, not a runbook.
Security analyst
Signals on file: CVSS 5.5. It is not currently listed in the CISA Known Exploited catalog. Weakness classes: CWE-787. Sources contributing to this record: nvd. Public exploit references, when present, are outbound links only and are not proof of active exploitation. This is a catalog interpretation of stored metadata.
Exploitation and remediation
Exploitation evidence
Not listed as known exploited in CISA KEV. Not in CISA KEV or VulnCheck KEV.
Patch and remediation
No required-action text is stored yet. Use the vendor or CERT links in Sources for patch availability.
Safe detection guidance
Compare installed versions with the affected ranges below and verify the advisory from the original publisher. This site stores metadata and outbound links only; it does not ship exploit code or proof-of-concept payloads.
Code
The project this record applies to. Exploit listings stay in References.
No public source repository is identified for this product.
Timeline
Detection, updates, and resolution for this record.
Jun 1, 2026 · NIST NVD
Detected
In wlan STA driver, there is a possible system crash due to a missing bounds check. This could lead to local denial of service with User execution privileges needed. User interaction is not needed for exploitation. Patch ID: WCNCR00480851; Issue ID: MSV-6338.
Jul 22, 2026 · NIST NVD
Updated
In wlan STA driver, there is a possible system crash due to a missing bounds check. This could lead to local denial of service with User execution privileges needed. User interaction is not needed for exploitation. Patch ID: WCNCR00480851; Issue ID: MSV-6338.
Affected
- cpe mediatek/mt7902 firmwareversion unspecified
- cpe mediatek/mt7920 firmwareversion unspecified
- cpe mediatek/mt7921 firmwareversion unspecified
- cpe mediatek/mt7922 firmwareversion unspecified
- cpe mediatek/mt7925 firmwareversion unspecified
- cpe mediatek/mt7927 firmwareversion unspecified
Sources
- NIST NVDVulnerability recordCVE-2026-20456
In wlan STA driver, there is a possible system crash due to a missing bounds check. This could lead to local denial of service with User execution privileges needed. User interaction is not needed for exploitation. Patch ID: WCNCR00480851; Issue ID: MSV-6338.
nvd.nist.gov