CVE-2026-74398 ipv6: addrconf: bail out of dad_failure when state is no longer POSTDAD

[
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    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "net/ipv6/addrconf.c"
    ],
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    ]
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  {
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    "vendor": "Linux",
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    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "net/ipv6/addrconf.c"
    ],
    "versions": [
      {
        "version": "3.14",
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      },
      {
        "version": "0",
        "lessThan": "3.14",
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      },
      {
        "version": "5.10.261",
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      {
        "version": "5.15.212",
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      {
        "version": "6.1.178",
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      },
      {
        "version": "6.6.145",
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      {
        "version": "6.12.97",
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      },
      {
        "version": "6.18.40",
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      {
        "version": "7.1.5",
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      },
      {
        "version": "7.2-rc1",
        "lessThanOrEqual": "*",
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        "versionType": "original_commit_for_fix"
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    ]
  }
]