A user-provided integer option was passed to nmreq_copyin() without checking if it would overflow. This insufficient bounds checking could lead to kernel memory corruption. On systems configured to include netmap in their devfs_ruleset, a privileged process running in a jail can affect the host environment.
https://security.netapp.com/advisory/ntap-20240322-0004/
https://security.freebsd.org/advisories/FreeBSD-SA-22:04.netmap.asc