CVE-2025-40363 net: ipv6: fix field-spanning memcpy warning in AH output

[
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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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      "net/ipv6/ah6.c"
    ],
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    ],
    "versions": [
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      {
        "version": "0",
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      {
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]