CVE-2025-38491 mptcp: make fallback action and fallback decision atomic

[
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    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "net/mptcp/options.c",
      "net/mptcp/protocol.c",
      "net/mptcp/protocol.h",
      "net/mptcp/subflow.c"
    ],
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      "net/mptcp/protocol.c",
      "net/mptcp/protocol.h",
      "net/mptcp/subflow.c"
    ],
    "versions": [
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        "version": "5.19",
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      {
        "version": "0",
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      {
        "version": "6.1.149",
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      {
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        "versionType": "original_commit_for_fix"
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    ]
  }
]