CVE-2025-37914 is a high-severity vulnerability in the Linux kernel's network scheduler (net_sched) subsystem. It involves a double list addition in the ets class when netem is used as a child queueing discipline (qdisc). This flaw can cause memory corruption due to the same classifier being added twice to an internal list. The issue arises from a reentrant enqueue callback in the parent qdisc triggered by netem. The vulnerability has been fixed by adding a check to prevent duplicate additions to the active list.