Linux vulnerability

What happened

In the Linux kernel, the following vulnerability has been resolved: sctp: close UDP tunnel sockets during netns teardown proc_sctp_do_udp_port() 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 sctp_ctrlsock_exit() 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.

Affected versions

Linux: 046c052b475e7119b6a30e3483e2888fc606a2f8 through before c29affd44e6769e3073235d4b471d9b501fa8166 (git); 046c052b475e7119b6a30e3483e2888fc606a2f8 through before c6eb2d615210b80339548ab07c0230edaab9a6c7 (git); 046c052b475e7119b6a30e3483e2888fc606a2f8 through before 8ff78591d309c50a4fdab683b68dd8d512a270dd (git); 046c052b475e7119b6a30e3483e2888fc606a2f8 through before 3bf0e349cbb4f975f35eb22753acc346b89c66a0 (git); 046c052b475e7119b6a30e3483e2888fc606a2f8 through before 37ff9794be48d0caa37687e04d09675f9c849121 (git); 046c052b475e7119b6a30e3483e2888fc606a2f8 through before ffb2bd7ade36ec4da32c46a6eddbf4515316d08c (git); 5.11 Fixed: See vendor advisory.

Why it matters

Review the vendor advisory and exposure of the affected product to determine operational impact.

Detection & mitigation

• Apply vendor-provided updates or mitigations.
• Review affected product exposure and access logs.