Linux Kernel CVE-2026-31778

Upgrade to patched kernel versions appropriate for your distribution's stable branch: 5.10.253 or later for 5.10.x LTS, 5.15.203+ for 5.15.x LTS, 6.1.168+ for 6.1.x LTS, 6.6.134+ for 6.6.x stable, 6.12.81+ for 6.12.x, 6.18.22+ for 6.18.x, 6.19.12+ for 6.19.x, or 7.0+ for mainline. Primary fix commit 02d9c5b0b555 changes loop bound from sizeof(card->id) to sizeof(card->id)-1, ensuring null terminator preservation. Vendor advisories and patches available at kernel.org stable tree references listed above. If immediate patching is not feasible, implement compensating controls: (1) Blacklist the snd_usb_caiaq kernel module via modprobe configuration (blacklist snd_usb_caiaq in /etc/modprobe.d/) if Native Instruments USB audio devices are not required-this completely eliminates attack surface but disables legitimate hardware functionality; (2) Restrict physical USB port access and disable USB device auto-loading for non-administrative users via udev rules-adds operational complexity in desktop environments; (3) In virtualized environments, disable USB passthrough for untrusted guest VMs-may impact legitimate USB audio workflows. Monitor kernel logs for KASAN stack-out-of-bounds warnings in snd_card_set_id_no_lock as potential exploitation indicators. Note that compensating controls trading functionality for security may not be acceptable in audio production environments where this hardware is commonly deployed.