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

tunnels: load network headers after skb_cow() in iptunnel_pmtud_build_icmp[v6]()

Sashiko found that iptunnel_pmtud_build_icmp() and
iptunnel_pmtud_build_icmpv6() were caching ip_hdr() and ipv6_hdr()
before an skb_cow() call which can reallocate skb->head.

Fix this possible UAF by initializing the local variables
after the skb_cow() call.

Remove skb_reset_network_header() calls which were not needed.

https://git.kernel.org/stable/c/50750d86a2e5266aba0c295483b3397843198b11

https://git.kernel.org/stable/c/6dff77899b9e9fe5d854abda3a98ad04e7229ef7

https://git.kernel.org/stable/c/7254aef4d1a7e18e887af9010e2f2dc34806789b

https://git.kernel.org/stable/c/76cd9398a0470257ab765bdf5f358a2af2e17934

https://git.kernel.org/stable/c/95b6d772bfe788331d9742d73eaa12e113b2adc4

https://git.kernel.org/stable/c/b4bc94353050b1fa7b702bd4c6600710dd926cff

https://git.kernel.org/stable/c/bf8b3f34c37c162357138e7c0942723b8b94fed1

https://git.kernel.org/stable/c/f3f204541f280a6ecb04503a0d6794d93990ca43

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