# CVE-2026-20558: MediaTek GPU PDMA use-after-free privilege escalation

Source: https://junglewise.ai/threats/cve-2026-20558-in-gpu-pdma-there-is-a-possible-escalation-of-privilege-due-to  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-11-02. Updated: 2026-11-02  
License: CC BY 4.0 with a link back

CVE-2026-20558 · Severity: info · Published 2026-11-02

MediaTek chipsets used in smartphones and IoT devices contain a use-after-free vulnerability in the GPU's packet DMA (PDMA) engine that allows a local attacker to escalate privileges without additional permissions or user interaction. An attacker with local access can exploit this memory corruption flaw to gain higher privileges and potentially compromise the entire device.

Technologies: [MediaTek Dimensity 5G](https://junglewise.ai/threats/technologies/dimensity-5g), [MediaTek Genio IoT](https://junglewise.ai/threats/technologies/genio-iot), [MediaTek Helio 4G](https://junglewise.ai/threats/technologies/helio-4g). Vendors: [MediaTek](https://junglewise.ai/threats/vendors/mediatek).

## Quick answers

**Is CVE-2026-20558 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-20558 being exploited in the wild.

**How severe is CVE-2026-20558?** Informational severity, published 2 November 2026.

**Which products and versions are affected?** MediaTek Dimensity 5G; MediaTek Helio 4G; MediaTek Genio IoT.

**Is there a fix for CVE-2026-20558?** 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-2026-20558 attacked?** It is attacked with local access.

**Am I affected by CVE-2026-20558?** Check whether you run MediaTek Dimensity 5G, MediaTek Genio IoT 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 use-after-free vulnerability exists in the MediaTek GPU PDMA component, allowing local privilege escalation. The flaw requires local code execution but no additional privileges or user interaction to exploit. Successful exploitation grants the attacker elevated privileges, and a patch (ALPS11365070) is available from MediaTek.

## Affected products

- MediaTek Dimensity 5G
- MediaTek Helio 4G
- MediaTek Genio IoT

## Timeline

- 2026-11-02: disclosed

## References

- [https://www.mediatek.com/product-security-bulletin/November-2026](https://www.mediatek.com/product-security-bulletin/November-2026)

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