CVE-2026-74696 tcp: fix TFO max_qlen accounting across reuseport migration

In the Linux kernel, the following vulnerability has been resolved: tcp: fix TFO maxqlen accounting across reuseport migration A listener's TCPFASTOPEN maxqlen stops being accurate and lets through far more pending Fast Open requests than it was configured for. This only shows up with SOREUSEPORT...

CVE-2026-74696

CVE-2026-74696 is a denial-of-service vulnerability in the Linux kernel's TCP Fast Open (TFO) implementation. The root cause is an accounting error in fastopenq.qlen during SO_REUSEPORT listener migration : when a listener is closed and its pending TFO children are handed to a surviving listener,...

PT-2026-79701

Name of the Vulnerable Software and Affected Versions Linux kernel affected versions not specified Description An issue exists in the TCP Fast Open TFO implementation where the max qlen accounting for a listener becomes inaccurate during SO REUSEPORT listener migration. When a listener is closed,...

Linux Distros Unpatched Vulnerability : CVE-2026-74696

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - tcp: fix TFO maxqlen accounting across reuseport migration A listener's TCPFASTOPEN maxqlen stops being accurate and lets through far more pending Fast Open...