What’s Vulnerable › Vulnerabilities

CVE-2026-68161: sctp: close UDP tunnel sockets during netns teardown

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-10 · updated 2026-10-19
• Weakness: CWE-404

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.

Affected products

• Linux kernel: 5.11 — fixed in 7.2

How to fix

Upgrade to a fixed version: Linux kernel 7.2. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/37ff9794be48d0caa37687e04d09675f9c849121
• https://git.kernel.org/stable/c/3bf0e349cbb4f975f35eb22753acc346b89c66a0
• https://git.kernel.org/stable/c/8ff78591d309c50a4fdab683b68dd8d512a270dd
• https://git.kernel.org/stable/c/c29affd44e6769e3073235d4b471d9b501fa8166
• https://git.kernel.org/stable/c/c6eb2d615210b80339548ab07c0230edaab9a6c7
• https://git.kernel.org/stable/c/ffb2bd7ade36ec4da32c46a6eddbf4515316d08c

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