CVE-2026-68161

In the Linux kernel, the following vulnerability has been resolved:

sctp: close UDP tunnel sockets during netns teardown

procsctpdoudpport() starts per-net SCTP UDP tunneling sockets when

net.sctp.udp_port is set, and stops/restarts them when the sysctl value

changes. The netns exit path does not stop these sockets, so a namespace

can be torn down while its SCTP UDP tunnel sockets are still installed.

Close the UDP tunnel sockets from sctpctrlsockexit() after unregistering

the per-net sysctl table. This prevents new sysctl writes from racing in

while the sockets are being released, and closes the sockets before the

control socket is destroyed.