The sctp_do_peeloff function in net/sctp/socket.c in the Linux kernel before 4.14 does not check whether the intended netns is used in a peel-off action, which allows local users to cause a denial of service (use-after-free and system crash) or possibly have unspecified other impact via crafted system calls.
3.13.0-142.1914.4.0-1014.144.4.0-116.140~14.04.14.4.0-116.1404.4.0-1052.614.13.0-1011.144.13.0-1011.154.13.0-41.46~16.04.14.4.0-1019.244.13.0-1021.23Exploitability
AV:LAC:LPR:LUI:NScope
S:UImpact
C:HI:HA:HCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H