It looks like only IPv4 is affected. IPv6 is working fine to a couple of test endpoints.
# grep model\ name /proc/cpuinfo
model name : Intel(R) Core(TM)2 Duo CPU E4500 @ 2.20GHz
# iucode_tool -S -l /lib/firmware/intel-ucode/* | tail -n1
iucode_tool: system has processor(s) with signature 0x000006fd
030/003: sig 0x000006fd, pf_mask 0x01, 2010-10-02, rev 0x00a4, size 4096
Last updated almost eight years ago, so doesn't contain any Spectre/Meltdown fixes. bratch@serenity ~ $ LC_TIME=en_GB cal | head -n2
May 2017
Mo Tu We Th Fr Sa Su
bratch@serenity ~ $ LC_TIME=en_US cal | head -n2
May 2017
Su Mo Tu We Th Fr Sa