CVE-2025-40300 x86/vmscape: Add conditional IBPB mitigation

[
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    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
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      "arch/x86/include/asm/entry-common.h",
      "arch/x86/include/asm/nospec-branch.h",
      "arch/x86/kernel/cpu/bugs.c",
      "arch/x86/kvm/x86.c"
    ],
    "versions": [
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    ]
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    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
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      "arch/x86/include/asm/entry-common.h",
      "arch/x86/include/asm/nospec-branch.h",
      "arch/x86/kernel/cpu/bugs.c",
      "arch/x86/kvm/x86.c"
    ],
    "versions": [
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      {
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      },
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      },
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      },
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      },
      {
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      },
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        "versionType": "original_commit_for_fix"
      }
    ]
  }
]