Quick answers
- Is CVE-2026-20591 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-20591 being exploited in the wild.
- How severe is CVE-2026-20591?
- Informational severity, published 2 November 2026.
- Which products and versions are affected?
- MediaTek Dimensity 5G; MediaTek Helio 4G.
- Is there a fix for CVE-2026-20591?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-20591 attacked?
- It is attacked with local access, in device firmware.
- Am I affected by CVE-2026-20591?
- Check whether you run MediaTek Dimensity 5G or MediaTek Helio 4G. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
A missing permission check in the GPU pdma driver allows local privilege escalation. The vulnerability can be exploited locally without additional execution privileges or user interaction needed. This is a permission validation flaw in the GPU DMA transfer handler that fails to properly verify caller permissions.
Affected products
- MediaTek Dimensity 5G
- MediaTek Helio 4G
Timeline
- 2026-11-02: disclosed