CVE-2026-31734 sched_ext: Fix is_bpf_migration_disabled() false negative on non-PREEMPT_RCU

[
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    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "kernel/sched/ext_idle.c"
    ],
    "versions": [
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    "product": "Linux",
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    "programFiles": [
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    ],
    "versions": [
      {
        "version": "6.18",
        "status": "affected"
      },
      {
        "version": "0",
        "lessThan": "6.18",
        "status": "unaffected",
        "versionType": "semver"
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      {
        "version": "6.18.22",
        "lessThanOrEqual": "6.18.*",
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      {
        "version": "6.19.12",
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      {
        "version": "7.0",
        "lessThanOrEqual": "*",
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        "versionType": "original_commit_for_fix"
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    ]
  }
]