CVE-2025-38402: 
Linux Kernel vulnerability analysis and mitigation

A vulnerability (CVE-2025-38402) was discovered in the Linux kernel's Intel IDPF driver affecting the ethtool implementation. The issue was disclosed on July 25, 2025, and affects devices that don't have RSS (Receive Side Scaling) capabilities set (NVD, RedHat).

The vulnerability stems from a logic error where the function returns -EOPNOTSUPP from a function returning u32, leading to an invalid cast and incorrect size value. This occurs specifically when executing the 'ethtool -x eth0' command on devices without RSS capabilities. The issue has been assigned a CVSS v3.1 score of 2.0 (Low) with a vector string of CVSS:3.1/AV:L/AC:L/PR:H/UI:R/S:U/C:N/I:N/A:L and is categorized under CWE-704 (RedHat).

The vulnerability can lead to allocation failures and system warnings when attempting to use ethtool commands on unsupported devices. While the bug may cause system instability or warnings, it is not directly exploitable and is considered a low-severity security issue (RedHat).

Red Hat has noted that mitigation options are either not available or do not meet their Product Security criteria for ease of use, deployment, and stability. The vulnerability affects Red Hat Enterprise Linux versions 8, 9, and 10, while versions 6 and 7 are not affected (RedHat).