- [August 18, 2026] → shadPS4 release notes — date shadPS4 published the stable 0.18.0 “UltraPersona” build
For players running shadPS4 on Intel’s 12th-generation-and-newer processors, dozens of PlayStation 4 games would crash or misbehave for a reason that had nothing to do with the games themselves. Windows was quietly clobbering a slice of stack memory the emulator’s code assumed was safe.
The fix is called “experimental red zone protection,” and it ships in shadPS4 0.18.0, codenamed UltraPersona, published on August 18, 2026 shadPS4 release notes. On those newer Intel chips under Windows, the operating system’s exception handling was overwriting the “red zone” — a 128-byte safety buffer below the stack pointer that the System V AMD64 ABI reserves for leaf functions Red zone (computing). Microsoft engineer Raymond Chen explained that Windows simply has no red zone on x86, and asked why one would even need to define it: “Why do we even need to define a red zone? Can’t I just use my stack for anything?” Games that counted on that buffer staying intact instead hit undefined behavior.
Windows was eating the buffer
The protection is narrowly scoped on purpose. It helps only 12th-gen-and-later Intel CPUs running Windows, not every machine, and the team flags it as experimental rather than a finished cure. That restraint matters: an emulator that silently patches low-level ABI behavior risks breaking other titles, so the developers are limiting the blast radius.
The release’s stated trigger was more ordinary. “The main reason for this release is broken shadNet authorization in certain cases on the 0.17.0 release,” the team wrote in the notes shadPS4 release notes. That bug locked some players out of shadNet, the project’s online custom server. A rewritten kernel event flag system also stopped Shadow of the Colossus from hanging at boot, and the game now reaches its menus consistently.
Video returns, but you do the wiring
Broken cutscene and trailer playback in several titles works again because AvPlayer can now load as LLE, a change uncovered by @liuk7071, the developer behind the rival ChonkyStation4 emulator. But the fix asks something of the player: they must supply the libSceAvPlayer.sprx module themselves, trading plug-and-play convenience for restored video.
shadPS4, an open-source PlayStation 4 emulator hosted on GitHub, keeps its casual voice even in a technical build GitHub canvases make AI agent work visible. “Happy testing :)” the team signed off, handing the long tail of per-game fixes to players: “that’s you, the testers’ and users’ job to figure out.”
GPU work repairs shadows in the Persona games and effects in inFAMOUS and Gravity Rush 2. For anyone who hit the Intel crash wall or the shadNet lockout, 0.18.0 is the build to grab — and a reminder that emulator progress still turns on a few named people and one carefully placed stack buffer.
