I ran a package update on a beowulf server last week, and now when I
login via SSH I have noticed that networking appears to be partially
broken. I can ping localhost, but no hosts outside of the machine,
either from local subnet or external like google. There seems to be
no outbound networking working.

# ping 8.8.8.8
PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data.
ping: sendmsg: Operation not permitted
ping: sendmsg: Operation not permitted
ping: sendmsg: Operation not permitted
ping: sendmsg: Operation not permitted
^C

# host google.com
;; connection timed out; no servers could be reached

# cat /etc/resolv.conf
nameserver 8.8.8.8
nameserver 8.8.4.4

# ping 127.0.0.1
PING 127.0.0.1 (127.0.0.1) 56(84) bytes of data.
64 bytes from 127.0.0.1: icmp_seq=1 ttl=64 time=0.067 ms
64 bytes from 127.0.0.1: icmp_seq=2 ttl=64 time=0.062 ms
64 bytes from 127.0.0.1: icmp_seq=3 ttl=64 time=0.063 ms
64 bytes from 127.0.0.1: icmp_seq=4 ttl=64 time=0.063 ms
^C

# traceroute localhost
traceroute to localhost (127.0.0.1), 30 hops max, 60 byte packets
1 localhost (127.0.0.1) 0.061 ms 0.027 ms 0.023 ms

# traceroute 8.8.8.8
traceroute to 8.8.8.8 (8.8.8.8), 30 hops max, 60 byte packets
send: Operation not permitted

# wget -O- checkip.dyndns.com
--2018-11-12 11:35:02-- http://checkip.dyndns.com/
Resolving checkip.dyndns.com (checkip.dyndns.com)... failed: Temporary
failure in name resolution.
wget: unable to resolve host address ‘checkip.dyndns.com’

Have there been any problematic package updates for beowulf/buster in
the past week?

Is there any way to recover from this, or am I stuck with reinstalling?

--Tom