Kernel code execution via out-of-bounds write

An out-of-bounds write in the Apple kernel on macOS, tvOS, and watchOS allows local users with root access to execute kernel code. Apple has not disclosed the affected kernel routine or the memory operation that permits the out-of-bounds write, stating only that improved memory handling addressed the issue. Exploitation requires an application already running with root privileges and can cross the remaining boundary into arbitrary execution with kernel privileges.