CVE-2023-54240: net: ethernet: mtk_eth_soc: fix possible NULL pointer dereference in mtk_hwlro_get_fdir_all()

Severity: unknown
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-12-30 · updated 2026-06-17

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.

Affected products

Linux kernel: 4.9 — fixed in 6.6

How to fix

Upgrade to a fixed version: Linux kernel 6.6. Check the vendor advisory for mitigations.

References

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

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