CVE-2025-21921

CVE-2025-21921: In the Linux kernel, net: ethtool: netlink: Allow NULL nlattrs when getting a phy_device, the crash occurs in ethnl_req_get_phydev() when tb is NULL (e.g., ethnl notify path) and a phy_device lookup is performed. The fix passes the cmd index and nlattr array separately to allow NU...