CVE-2026-63972

In the Linux kernel, the following vulnerability has been resolved:

net: mana: Skip redundant detach on already-detached port

When mana_per_port_queue_reset_work_handler() runs after a previous

detach succeeded but attach failed, the port is left in a detached

state with apc->tx_qp and apc->rxqs already freed. Calling

mana_detach() again unconditionally leads to NULL pointer dereferences

during queue teardown.

Add an early exit in mana_detach() when the port is already in

detached state (!netif_device_present) for non-close callers, making

it safe to call idempotently. This allows the queue reset handler and

other recovery paths to simply retry mana_attach() without redundant

teardown.