CVE-2025-22103

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> net: fix NULL pointer dereference in l3mdev_l3_rcv<br /> <br /> When delete l3s ipvlan:<br /> <br /> ip link del link eth0 ipvlan1 type ipvlan mode l3s<br /> <br /> This may cause a null pointer dereference:<br /> <br /> Call trace:<br /> ip_rcv_finish+0x48/0xd0<br /> ip_rcv+0x5c/0x100<br /> __netif_receive_skb_one_core+0x64/0xb0<br /> __netif_receive_skb+0x20/0x80<br /> process_backlog+0xb4/0x204<br /> napi_poll+0xe8/0x294<br /> net_rx_action+0xd8/0x22c<br /> __do_softirq+0x12c/0x354<br /> <br /> This is because l3mdev_l3_rcv() visit dev-&gt;l3mdev_ops after<br /> ipvlan_l3s_unregister() assign the dev-&gt;l3mdev_ops to NULL. The process<br /> like this:<br /> <br /> (CPU1) | (CPU2)<br /> l3mdev_l3_rcv() |<br /> check dev-&gt;priv_flags: |<br /> master = skb-&gt;dev; |<br /> |<br /> | ipvlan_l3s_unregister()<br /> | set dev-&gt;priv_flags<br /> | dev-&gt;l3mdev_ops = NULL;<br /> |<br /> visit master-&gt;l3mdev_ops |<br /> <br /> To avoid this by do not set dev-&gt;l3mdev_ops when unregister l3s ipvlan.