CVE-2026-72243 in Linux

Summary

by MITRE • 08/15/2026

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.

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

• Responsible: Linux
• Reservation: 08/09/2026
• Disclosure: 08/15/2026
• Moderation: accepted
• Entry: VDB-390658
• CPE: ready
• CWE: CWE-275 (confirmed)
• CVSS: 9.9 (VulDB)
• EPSS: 0.00000
• KEV: no
• Activities: very low
• Sector: Lawfirm, Hostingprovider, ...

Sources

• MITRE: https://www.cve.org/CVERecord?id=CVE-2026-72243
• NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-72243
• CVE Details: https://www.cvedetails.com/cve/CVE-2026-72243/