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

udp: fix potential use-after-free in tunnel segmentation

__skb_udp_tunnel_segment() gets the UDP header before ensuring the
tunnel header is in the skb head. If the pull reallocates skb->head,
the saved UDP header pointer is no longer valid.

Get the UDP header after the pull to avoid a potential use-after-free.

https://git.kernel.org/stable/c/19d89b13a43640b2da2f277ee462d919d988cb6f

https://git.kernel.org/stable/c/1ae134c012e10384cdac420b5cc6e0615cde0b55

https://git.kernel.org/stable/c/5161e67c561c4f28a5d9335a6e859b02511de92b

https://git.kernel.org/stable/c/588d4a6795d99d080f74ef0b5f391ea8c453ae5d

https://git.kernel.org/stable/c/64d322c288577793eedd352b96ef75234ed380fe

https://git.kernel.org/stable/c/6a733a38b983d8c2e222f13968209010cf44de87

https://git.kernel.org/stable/c/b3df61bb745eb5201eac22679a2839d4ccbf3442

https://git.kernel.org/stable/c/d0f86fb36eb260abd10007b62c9dcc1028e03e61

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