Errata patches for the kernel have been released for OpenBSD 6.5 and 6.6.
Local outbound UDP broadcast or multicast packets sent by a spliced
socket can crash the kernel.
Binary updates for the amd64, i386, and arm64 platforms are available
via the syspatch utility. Source code patches can be found on the
respective errata page:
https://www.openbsd.org/errata65.html
https://www.openbsd.org/errata66.html
As these affect the kernel, a reboot will be needed after patching.
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