Errata patches for the kernel have been released for OpenBSD 6.4 and 6.5.
Intel CPUs have a cross privilege side-channel attack. (MDS)
Binary updates for the amd64 platform are available via the syspatch utility. Source code patches can be found on the respective errata page:
https://www.openbsd.org/errata64.html
https://www.openbsd.org/errata65.html
After patching, run fw_update to get the new CPU microcode, then reboot.
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