(Thanks to everyone for this thread and this forum! Been invaluable.)
My XP/Posready-patched system has been running smoothly for years. I applied the August round of Windows updates (except the earlier KB4134651) 9 days ago.
Today, I blue screened at a random-seeming moment with a STOP 0x50 (PAGE_FAULT_IN_NONPAGED_AREA, read) in win32k.sys (last modified date 6/15/18). (One up the call chain is ntoskrnl, last mod 5/20/18)
Coincidence? Sure, maybe my hardware just started failing today. But it's suspicious timing. Faulty update? I see that the win32k.sys updated happened via KB4339854 in July (patch for CVE-2018-8282), which I installed one month ago. I'm tempted to uninstall that one.
Anyway, just FYI, and wondering if anyone else is seeing recent crashes.
Thanks, all!