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CVE-2026-72243

8.4 · HIGH

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 sup…

Published Aug 15, 2026EPSS 0.17%

Overview

CVE-2026-72243 is a high-severity vulnerability. It was published on August 15, 2026 and has a CVSS 3.1 base score of 8.4 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.4, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/11406d0d7e11b4e525bb2ace2c70107031d058daRefgit.kernel.org/stable/c/44c74d27d1b9aaa99fa8a83640c1223575262b80Refgit.kernel.org/stable/c/646ebbc5f2ff9147d084e1213143f091026a611cRefgit.kernel.org/stable/c/d028bc080a0dcd6a7f8e1ae1bd32dda696505ba3Refgit.kernel.org/stable/c/e507633bf76bccf1a6af27771fb0d6e2862b7eacRefgit.kernel.org/stable/c/fc633a598206d4f23af782db7c0b5f3a82751d2c

How CyberStrike helps

Frequently asked questions

What is CVE-2026-72243?

CVE-2026-72243 is a high-severity vulnerability. It was published on August 15, 2026 and has a CVSS 3.1 base score of 8.4 (HIGH).

How severe is CVE-2026-72243?

This vulnerability has a CVSS 3.1 base score of 8.4, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-72243?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-72243?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-72243 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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