CVE-2025-38192 net: clear the dst when changing skb protocol

In the Linux kernel, the following vulnerability has been resolved: net: clear the dst when changing skb protocol A not-so-careful NAT46 BPF program can crash the kernel if it indiscriminately flips ingress packets from v4 to v6: BUG: kernel NULL pointer dereference, address: 0000000000000000...

CVE-2025-38192

CVE-2025-38192 is a Linux kernel vulnerability where an ingress NAT46 BPF program that flips IPv4/IPv6 can mutate skb->protocol to v6 while the dst remains IPv4, leading to a NULL pointer dereference in ip6_rcv_core. The fix is to clear the destination (dst) in all BPF helpers that change skb-...