CVE-2026-63973

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

net: mana: Add NULL guards in teardown path to prevent panic on attach failure

When queue allocation fails partway through, the error cleanup frees

and NULLs apc->tx_qp and apc->rxqs. Multiple teardown paths such as

mana_remove(), mana_change_mtu() recovery, and internal error handling

in mana_alloc_queues() can subsequently call into functions that

dereference these pointers without NULL checks:

- mana_chn_setxdp() dereferences apc->rxqs[0], causing a NULL pointer

dereference panic (CR2: 0000000000000000 at mana_chn_setxdp+0x26).

- mana_destroy_vport() iterates apc->rxqs without a NULL check.

- mana_fence_rqs() iterates apc->rxqs without a NULL check.

- mana_dealloc_queues() iterates apc->tx_qp without a NULL check.

Add NULL guards for apc->rxqs in mana_fence_rqs(),

mana_destroy_vport(), and before the mana_chn_setxdp() call. Add a

NULL guard for apc->tx_qp in mana_dealloc_queues() to skip TX queue

draining when TX queues were never allocated or already freed.