CVE-2026-58086

As an inadvertent side effect of an unrelated code change, PRIV_KTRACE was always denied to a jailed root user.  Tracing configured by a jailed root user was therefore not flagged as privileged.

An unprivileged user in a jail that has permission to debug the target process can modify the jailed root user's ktrace(2) flags, or disable tracing outright.  A jailed root user therefore cannot reliably trace unprivileged processes.