neigh: let neigh_xmit take skb ownership

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CVE-2023-53338

In the Linux kernel, the following vulnerability has been resolved: lwt: Fix return values of BPF xmit ops BPF encap ops can return different types of positive values, such like NETRXDROP, NETXMITCN, NETDEVTXBUSY, and so on, from function skbdoredirect and bpflwtxmitreroute. At the xmit hook, suc...

CVE-2023-53338

CVE-2023-53338 affects the Linux kernel’s lwt/BPF xmit path. The vulnerability arises from BPF encap/xmit return values being misinterpreted by the xmit hook, causing use-after-free and kernel crashes as freed SKBs reach the neighbor subsystem. The supplied advisories indicate a fix that discards...