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

net/sched: sch_multiq: Replace direct dequeue call with peek and qdisc_dequeue_peeked

multiq_dequeue() takes a packet from a band's child with a direct
->dequeue() call after multiq_peek() peeked it. When the child is
non-work-conserving the peek stashes the skb in the child's gso_skb, so
the direct dequeue returns a different skb and orphans the stash,
desyncing the child's qlen/backlog. With a qfq child reached through a
peeking parent (e.g. tbf) this re-enters the child on an emptied list and
dereferences NULL, panicking the kernel from softirq on ordinary egress.

Take the packet through qdisc_dequeue_peeked(), as sch_prio already does
and as sch_red and sch_sfb were just fixed to do. The helper is a no-op
when the child has no stash, so a work-conserving child is unaffected.

https://git.kernel.org/stable/c/1b9cc255e8089606b92b2adf504e334573682821

https://git.kernel.org/stable/c/3e5fd9d14f2d228e7260251f2e4a1d41ba8f705a

https://git.kernel.org/stable/c/54f6b0c843e228d499eb4b6bbb89df68cad9ad5d

https://git.kernel.org/stable/c/5889064919a1e5c0a9469c54895000414fc46944

https://git.kernel.org/stable/c/7a5a1582710981ef6637de9f074a60a5b1d63222

https://git.kernel.org/stable/c/86a61e46a1919e8abf4d227c204773dabb24068a

https://git.kernel.org/stable/c/eb1a9637f0bd84b5db8803af65dfb1f44785406f

https://git.kernel.org/stable/c/fffeb2ab5eeb823d4c2330571a098f63237c9049

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