Description

In the Linux kernel, the following vulnerability has been resolved:

net: dsa: mv88e6xxx: Correct check for empty list

Since commit a3c53be55c95 ("net: dsa: mv88e6xxx: Support multiple MDIO
busses") mv88e6xxx_default_mdio_bus() has checked that the
return value of list_first_entry() is non-NULL.

This appears to be intended to guard against the list chip->mdios being
empty. However, it is not the correct check as the implementation of
list_first_entry is not designed to return NULL for empty lists.

Instead, use list_first_entry_or_null() which does return NULL if the
list is empty.

Flagged by Smatch.
Compile tested only.

Classification

CVE ID: CVE-2024-42224

CVSS Base Severity: MEDIUM

CVSS Base Score: 6.1

CVSS Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H

Affected Products

Vendor: Linux

Product: Linux

Exploit Prediction Scoring System (EPSS)

EPSS Score: 0.07% (probability of being exploited)

EPSS Percentile: 21.64% (scored less or equal to compared to others)

EPSS Date: 2025-06-02 (when was this score calculated)

Stakeholder-Specific Vulnerability Categorization (SSVC)

SSVC Exploitation: none

SSVC Technical Impact: partial

SSVC Automatable: false

References

https://nvd.nist.gov/vuln/detail/CVE-2024-42224
https://git.kernel.org/stable/c/47d28dde172696031c880c5778633cdca30394ee
https://git.kernel.org/stable/c/3bf8d70e1455f87856640c3433b3660a31001618
https://git.kernel.org/stable/c/2a2fe25a103cef73cde356e6d09da10f607e93f5
https://git.kernel.org/stable/c/8c2c3cca816d074c75a2801d1ca0dea7b0148114
https://git.kernel.org/stable/c/aa03f591ef31ba603a4a99d05d25a0f21ab1cd89
https://git.kernel.org/stable/c/3f25b5f1635449036692a44b771f39f772190c1d
https://git.kernel.org/stable/c/f75625db838ade28f032dacd0f0c8baca42ecde4
https://git.kernel.org/stable/c/4c7f3950a9fd53a62b156c0fe7c3a2c43b0ba19b

Timeline