CVE-2026-18417 Wild pointer dereference in Zephyr BSD sockets when a TCP listening socket reports an asynchronous error

The native BSD-socket layer recorded a pending asynchronous socket error by type-punning it into struct netcontext's void userdata field ctx-userdata = INTTOPOINTER-status in zsockacceptedcb, zsockreceivedcb, zsockconnectedcb and zsockclosectx in subsys/net/lib/sockets/socketsinet.c, reading it...