CVE-2026-72243: selinux: check connect-related permissions on TCP Fast Open

Severity: high (CVSS 8.4 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-08-15 · updated 2026-10-16

Description

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.

Affected products

Linux kernel: 3.6 — 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/11406d0d7e11b4e525bb2ace2c70107031d058da
https://git.kernel.org/stable/c/44c74d27d1b9aaa99fa8a83640c1223575262b80
https://git.kernel.org/stable/c/646ebbc5f2ff9147d084e1213143f091026a611c
https://git.kernel.org/stable/c/d028bc080a0dcd6a7f8e1ae1bd32dda696505ba3
https://git.kernel.org/stable/c/e507633bf76bccf1a6af27771fb0d6e2862b7eac
https://git.kernel.org/stable/c/fc633a598206d4f23af782db7c0b5f3a82751d2c

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