An errata patch for the kernel has been released for OpenBSD 6.9 and OpenBSD 7.0.
Opening /dev/bpf too quickly too often could lead to a kernel crash. Binary updates for the amd64, i386 and arm64 platform are available via the syspatch utility. Source code patches can be found on the respective errata page: https://www.openbsd.org/errata69.html https://www.openbsd.org/errata70.html