base_sock_create in drivers/isdn/mISDN/socket.c in the AF_ISDN network module in the Linux kernel through 5.3.2 does not enforce CAP_NET_RAW, which means that unprivileged users can create a raw socket, aka CID-b91ee4aa2a21.
4.4.0-168.1974.4.0-1098.1094.15.0-1054.56~16.04.14.15.0-1063.684.15.0-1049.524.15.0-69.78~16.04.14.4.0-1062.694.15.0-1029.32~16.04.14.4.0-1125.1344.4.0-1129.137Exploitability
AV:LAC:LPR:LUI:NScope
S:UImpact
C:NI:LA:NCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N