Errata patches have been released for OpenBSD 6.1 and 6.0. A kernel executable address was leaked to userland.
Binary updates for the amd64 platform are available via the syspatch utility. Source code patches can be found on the respective errata pages: https://www.openbsd.org/errata60.html https://www.openbsd.org/errata61.html As this affects the kernel, a reboot will be needed after patching.