CVE-2026-23439 udp_tunnel: fix NULL deref caused by udp_sock_create6 when CONFIG_IPV6=n

[
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    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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      "include/net/udp_tunnel.h"
    ],
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      {
        "version": "0",
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      {
        "version": "5.10.253",
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      {
        "version": "5.15.203",
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      {
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]