Linux Kernel EUVD-2026-30021

The primary remediation is upgrading to a patched kernel version. Three stable-tree fix commits are available: 214b6bde0e941a34ba877cf2f26f85d62fb5d598 (targeting 6.18.19, at https://git.kernel.org/stable/c/214b6bde0e941a34ba877cf2f26f85d62fb5d598), d1c991c860496d97044802ea54b30f20db468c1d (targeting 6.19.9, at https://git.kernel.org/stable/c/d1c991c860496d97044802ea54b30f20db468c1d), and 9478c166c46934160135e197b049b5a05753f2ad (targeting 7.0, at https://git.kernel.org/stable/c/9478c166c46934160135e197b049b5a05753f2ad). Distribution vendors should be monitored for backported kernel packages incorporating these commits. As an immediate compensating control for high-risk environments, removing panic_on_warn=1 from kernel boot parameters prevents WARN_ON events from escalating to kernel panics, substantially reducing impact on hardened systems; the trade-off is reduced kernel fault detection sensitivity. Alternatively, blacklisting the nouveau module (echo 'blacklist nouveau' >> /etc/modprobe.d/blacklist.conf) eliminates the vulnerable code path entirely, but requires migrating to the proprietary NVIDIA driver or integrated graphics, which may not be feasible on all systems.