Linux Kernel iwlwifi EUVD-2026-28609

Apply vendor-supplied kernel patches immediately: upgrade to Linux kernel 6.18.22 or later for 6.18.x series, 6.19.12 or later for 6.19.x series, or 7.0 stable release when available. Patches are available via upstream commits 323156c3541e23da7e582008a7ac30cd51b60acd, 6607d0e58ceca997816122568ce54db9e134edab, and c0b3fa5e0eaecd38e6a9f8f78e86f468fbde719a (see https://git.kernel.org/stable/c/323156c3541e23da7e582008a7ac30cd51b60acd and related links). The fix adds capability checking to prevent sending MCC_ALLOWED_AP_TYPE_CMD to devices without 6E support. If immediate patching is not feasible, temporary mitigation on systems with AX201 adapters includes: (1) blacklisting the iwlmvm kernel module and using alternative network connectivity (Ethernet, USB Wi-Fi), though this completely disables built-in wireless - acceptable for wired-primary deployments but impacts mobile/wireless-dependent systems; (2) restricting unprivileged user access to wireless configuration via udev rules and capability restrictions, reducing attack surface but not eliminating risk from users with legitimate network management privileges. These workarounds trade wireless functionality or usability for stability and should be considered temporary only.