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CVE-2026-72243

HighPublished

selinux: check connect-related permissions on TCP Fast Open

Published: Aug 15, 2026
Updated: Aug 18, 2026
Assigning CNA: Linux
Evidence observed: Sep 9, 2026

Primary CVSS

8.4/ 10High

nvd · CVSS 3.1

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N

EPSS probability estimate

0.2%

Low · next 30 days

Percentile: 5.7%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

In the Linux kernel, the following vulnerability has been resolved: selinux: check connect-related permissions on TCP Fast Open Similar to Landlock, SELinux was not updated when TCP Fast Open support was introduced to ensure connect-related permissions are checked when using TCP Fast Open. Update its socket_sendmsg() hook to call selinux_socket_connect() when MSG_FASTOPEN is passed.

Sources

tfo-connect-bypassPoC
Using TCP Fast Open to bypass syscall-based networking rules (CVE-2026-63828/CVE-2026-72243 PoC)

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