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

net/sched: cls_api: Handle TC_ACT_CONSUMED in tcf_qevent_handle

tcf_classify() can return TC_ACT_CONSUMED while the skb is held by the
defragmentation engine (e.g. act_ct on out-of-order fragments). When
that happens the skb is no longer owned by the caller and must not be
touched again.

tcf_qevent_handle() did not handle TC_ACT_CONSUMED: it fell through the
switch and returned the skb to the caller as if classification had
passed. The only qdisc that wires up qevents today is RED, via three call sites
(qe_mark on RED_PROB_MARK/HARD_MARK, qe_early_drop on congestion_drop)
red_enqueue() was continuing to operate on an skb it no longer owns  in this
case -- enqueueing it, dropping it, or updating statistics. Resulting in a UAF.

  tc qdisc add dev eth0 root handle 1: red ... qevent early_drop block 10
  tc filter add block 10 ... action ct

  (with ct defrag enabled and traffic that produces out-of-order
  fragments, e.g. a fragmented UDP stream)

Handle TC_ACT_CONSUMED in tcf_qevent_handle() the same way the ingress
and egress fast paths do: treat it as stolen and return NULL without
touching the skb. Unlike the TC_ACT_STOLEN case, the skb must not be
dropped/freed here, as it is no longer owned by us.

https://git.kernel.org/stable/c/2140c2f3f2e7b066e1ae616ede8856cafd8015e9

https://git.kernel.org/stable/c/447d493034a9cf7bf13a2abac86d0573d907ec2f

https://git.kernel.org/stable/c/5ed3d6f85991656667059d3fa5a1d683ac58c447

https://git.kernel.org/stable/c/a8a02897f2b479127db261de05cbf0c28b98d159

https://git.kernel.org/stable/c/e1270e69dcf2c3512c453484178f2e9dc0db3f05

https://git.kernel.org/stable/c/e28aedab9488343924d227b5a896faed67ce84d5

https://git.kernel.org/stable/c/f42e8134a3a1074b834a574d404352f867ba994a

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