CVE-2026-68161

sctp: close UDP tunnel sockets during netns teardown

State: Published
Severity: 9.8 Critical
Published: Aug 10, 2026
Updated: Oct 19, 2026
Reserved: Jul 30, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
3.1	9.8 Critical	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	Linux

Weaknesses

CWE-404 Improper Resource Shutdown or Release

Affected Products

Product	Versions
LinuxLinux	046c052b475e7119b6a30e3483e2888fc606a2f8 to before c29affd44e6769e3073235d4b471d9b501fa8166Affected 046c052b475e7119b6a30e3483e2888fc606a2f8 to before c6eb2d615210b80339548ab07c0230edaab9a6c7Affected 046c052b475e7119b6a30e3483e2888fc606a2f8 to before 8ff78591d309c50a4fdab683b68dd8d512a270ddAffected 046c052b475e7119b6a30e3483e2888fc606a2f8 to before 3bf0e349cbb4f975f35eb22753acc346b89c66a0Affected 046c052b475e7119b6a30e3483e2888fc606a2f8 to before 37ff9794be48d0caa37687e04d09675f9c849121Affected 046c052b475e7119b6a30e3483e2888fc606a2f8 to before ffb2bd7ade36ec4da32c46a6eddbf4515316d08cAffected
LinuxLinux	5.11Affected before 5.11Not affected 6.1.189 through 6.1.Not affected 6.6.151 through 6.6.Not affected 6.12.101 through 6.12.Not affected 6.18.42 through 6.18.Not affected 7.1.6 through 7.1.*Not affected 7.2 and laterNot affected

Product

Versions

LinuxLinux

046c052b475e7119b6a30e3483e2888fc606a2f8 to before c29affd44e6769e3073235d4b471d9b501fa8166Affected
046c052b475e7119b6a30e3483e2888fc606a2f8 to before c6eb2d615210b80339548ab07c0230edaab9a6c7Affected
046c052b475e7119b6a30e3483e2888fc606a2f8 to before 8ff78591d309c50a4fdab683b68dd8d512a270ddAffected
046c052b475e7119b6a30e3483e2888fc606a2f8 to before 3bf0e349cbb4f975f35eb22753acc346b89c66a0Affected
046c052b475e7119b6a30e3483e2888fc606a2f8 to before 37ff9794be48d0caa37687e04d09675f9c849121Affected
046c052b475e7119b6a30e3483e2888fc606a2f8 to before ffb2bd7ade36ec4da32c46a6eddbf4515316d08cAffected

LinuxLinux

5.11Affected
before 5.11Not affected
6.1.189 through 6.1.*Not affected
6.6.151 through 6.6.*Not affected
6.12.101 through 6.12.*Not affected
6.18.42 through 6.18.*Not affected
7.1.6 through 7.1.*Not affected
7.2 and laterNot affected

References

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