The __netlink_deliver_tap_skb function in net/netlink/af_netlink.c in the Linux kernel through 4.14.4, when CONFIG_NLMON is enabled, does not restrict observations of Netlink messages to a single net namespace, which allows local users to obtain sensitive information by leveraging the CAP_NET_ADMIN capability to sniff an nlmon interface for all Netlink activity on the system.
3.13.0-149.1994.4.0-1016.164.4.0-119.143~14.04.14.4.0-119.1434.4.0-1054.634.13.0-1018.214.13.0-1017.214.13.0-43.48~16.04.14.4.0-1020.254.13.0-1028.31Exploitability
AV:LAC:HPR:LUI:NScope
S:UImpact
C:HI:NA:NCVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N