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Change History

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

udp: call skb_orphan() before skb_attempt_defer_free()

Standard UDP receive path does not use skb->destructor.

But skmsg layer does use it, since it calls skb_set_owner_sk_safe()
from udp_read_skb().

This then triggers this warning in skb_attempt_defer_free():

    DEBUG_NET_WARN_ON_ONCE(skb->destructor);

We must call skb_orphan() to fix this issue.

https://git.kernel.org/stable/c/0c63d5683eae6a7b4d81382bcbecb2a19feff90d

https://git.kernel.org/stable/c/e5c8eda39a9fc1547d1398d707aa06c1d080abdd