CVE-2026-43485

No attack vector exists. The vulnerability is a kernel warning (WARN_ON) triggered during normal ACPI probing in the nouveau GSP driver. An unprivileged user or a system with certain ACPI tables can cause the kernel to emit a WARN_ON backtrace, which may be interpreted as a security event or cause unnecessary noise, but does not allow code execution or privilege escalation. The advisory does not specify any attacker-controlled input or network path.

The patches target ACPI probe functions within the nouveau GSP (GPU System Processor) driver in the Linux kernel. The exact file paths are not shown in the advisory, but the patches modify code paths that call WARN_ON during ACPI table parsing and device probing.

The patches [patch_id=424542, patch_id=424543, patch_id=424544] remove WARN_ON calls from the nouveau GSP ACPI probe paths. The WARN_ONs were triggering frequently under normal conditions with no known fix plan, and the maintainers assessed them as most likely harmless. By replacing WARN_ON with simple conditional checks or removing them entirely, the kernel no longer produces warning backtraces for these benign ACPI probe scenarios, reducing false-positive security alerts and unnecessary log noise.