Linux Kernel CVE-2026-31655

The primary fix is upgrading to a patched kernel version: 6.6.135 or later (LTS), 6.12.82 or later (LTS), 6.18.23 or later, 6.19.13 or later, or kernel 7.0+. Patch commits are available upstream at the kernel stable repository (e.g., https://git.kernel.org/stable/c/80fd0de89805a3f92dc320f5ab5a18007c260374 for one branch). Ubuntu users should apply the fix via USN-8567-1; Red Hat and SUSE users should track their respective kernel security advisories. As a compensating control, if immediate patching is not possible on i.MX 8M Plus devices, operators can avoid triggering aggressive power management on the NoC HDCP domain by disabling runtime PM for the affected block controller via kernel boot parameters (e.g., adding the device to a PM blacklist via Device Tree overlay) - however this trades power efficiency for stability and requires platform-specific testing. There is no viable network-based mitigation since this is a local hardware power-management defect.