Critical 9.8Published Aug 10, 2026

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

Updated under an hour ago (Oct 26, 2026, 10:00 PM ET)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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.

CVSS: 9.8 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-404
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Received
Record last updated: Oct 19, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 046c052b475e7119b6a30e3483e2888fc606a2f8 before c29affd44e6769e3073235d4b471d9b501fa8166; from 046c052b475e7119b6a30e3483e2888fc606a2f8 before c6eb2d615210b80339548ab07c0230edaab9a6c7; 046c052b475e7119b6a30e3483e2888fc606a2f8 builds before 8ff78591d309c50a4fdab683b68dd8d512a270dd; 046c052b475e7119b6a30e3483e2888fc606a2f8 builds before 3bf0e349cbb4f975f35eb22753acc346b89c66a0; 046c052b475e7119b6a30e3483e2888fc606a2f8 builds before 37ff9794be48d0caa37687e04d09675f9c849121; from 046c052b475e7119b6a30e3483e2888fc606a2f8 before ffb2bd7ade36ec4da32c46a6eddbf4515316d08c	CNA record

References

References

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

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.