In the Linux kernel, the following vulnerability has been resolved: netfilter: nftables: avoid skb access on nfstolen When verdict is NFSTOLEN, the skb might have been freed. When tracing is enabled, this can result in a use-after-free: 1. access to skb->nftrace 2. access to skb->mark 3. computation of trace id 4. dump of packet payload To avoid 1, keep a cached copy of skb->nf_trace in the trace state struct. Refresh this copy whenever verdict is != STOLEN. Avoid 2 by skipping skb->mark access if verdict is STOLEN. 3 is avoided by precomputing the trace id. Only dump the packet when verdict is not "STOLEN".