Linux prepares to axe legacy x32 hybrid mode — hybrid 32-bit/64-bit mode faces complete removal by 2027 due to low adoption

Linux developers are considering removing the old x32 ABI from the kernel, likely as early as 2027 if no one objects.

The x32 ABI was designed to blend 64-bit performance with 32-bit pointers for better memory efficiency, but it never saw broad adoption.

Its limited per-process memory ceiling, added complexity, and weak real-world use made it a poor fit for most workloads.

Dropping x32 would simplify kernel maintenance and retire another long-unused legacy interface.