CVE-2026-68161

Critical

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.

SeverityCritical

CVSS9.8

Exploit probability—

Product

Linux

PublishedAug 10, 2026

First seenAug 10, 2026

Weakness typeCWE-404CWE-404

How to fix

Update

Linux Linuxc29affd44e6769e3073235d4b471d9b501fa8166, c6eb2d615210b80339548ab07c0230edaab9a6c7, 8ff78591d309c50a4fdab683b68dd8d512a270dd, 3bf0e349cbb4f975f35eb22753acc346b89c66a0, 37ff9794be48d0caa37687e04d09675f9c849121, ffb2bd7ade36ec4da32c46a6eddbf4515316d08c or later

Affected products

Product	Affected versions	Fixed in
Linux Linux	046c052b475e7119b6a30e3483e2888fc606a2f8 ≤ v < c29affd44e6769e3073235d4b471d9b501fa8166, 046c052b475e7119b6a30e3483e2888fc606a2f8 ≤ v < c6eb2d615210b80339548ab07c0230edaab9a6c7, 046c052b475e7119b6a30e3483e2888fc606a2f8 ≤ v < 8ff78591d309c50a4fdab683b68dd8d512a270dd, 046c052b475e7119b6a30e3483e2888fc606a2f8 ≤ v < 3bf0e349cbb4f975f35eb22753acc346b89c66a0, 046c052b475e7119b6a30e3483e2888fc606a2f8 ≤ v < 37ff9794be48d0caa37687e04d09675f9c849121, 046c052b475e7119b6a30e3483e2888fc606a2f8 ≤ v < ffb2bd7ade36ec4da32c46a6eddbf4515316d08c, 5.11	c29affd44e6769e3073235d4b471d9b501fa8166, c6eb2d615210b80339548ab07c0230edaab9a6c7, 8ff78591d309c50a4fdab683b68dd8d512a270dd, 3bf0e349cbb4f975f35eb22753acc346b89c66a0, 37ff9794be48d0caa37687e04d09675f9c849121, ffb2bd7ade36ec4da32c46a6eddbf4515316d08c

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