How to Fix CVE-2026-20436: MediaTek chipset (Bundle Sibling)
By Sai Kiran Pandrala. Last verified: 2026-05-25.
CVE-2026-20436 is a sibling vulnerability in the same vendor advisory as CVE-2026-20416. Apply the same patched build and you close both. The technical detail below is what differs.
| Severity | 6.7 (Medium) |
|---|---|
| Actively exploited? | No public listing in CISA KEV |
| Affected | MediaTek chipset MT7902; MediaTek chipset MT7920; MediaTek chipset MT7921; MediaTek chipset MT7922; MediaTek chipset MT7925; MediaTek chipset MT7927; MediaTek chipset MT8696 |
| Fixed in | Same patched build as CVE-2026-20416 |
| Type (CWE) | CWE-120 Classic Buffer Overflow |
What's different about CVE-2026-20436?
In wlan STA driver, there is a possible escalation of privilege due to a missing bounds check. This could lead to local escalation of privilege if a malicious actor has already obtained the System privilege. User interaction is not needed for exploitation. Patch ID: WCNCR00473802; Issue ID: MSV-5970.
How to fix CVE-2026-20436
Apply the patched build per the primary write-up: How to Fix CVE-2026-20416. All commands, verification steps, and rollback notes for MediaTek chipset are listed there.
Frequently asked questions
Does the CVE-2026-20416 patch close CVE-2026-20436?
Yes. Both CVEs are addressed by the same vendor patch. Applying the patched build closes the full bundle.
Is CVE-2026-20436 listed in CISA KEV?
No public KEV listing at the time of this writing.
Where is the official advisory?
See https://corp.mediatek.com/product-security-bulletin/March-2026
References
- Official vendor advisory: https://corp.mediatek.com/product-security-bulletin/March-2026
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-20436
- CISA KEV catalog: https://www.cisa.gov/known-exploited-vulnerabilities-catalog
- Primary: How to Fix CVE-2026-20416
*Written by Sai Kiran Pandrala. Part of the MediaTek chipset bundle. Full procedure at how-to-fix-cve-2026-20416.*