CVE-2025-38457 net/sched: Abort __tc_modify_qdisc if parent class does not exist

[
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    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "net/sched/sch_api.c"
    ],
    "versions": [
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    "programFiles": [
      "net/sched/sch_api.c"
    ],
    "versions": [
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      },
      {
        "version": "0",
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        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "5.4.296",
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      },
      {
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      {
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      {
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      {
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      {
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      {
        "version": "6.16",
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        "versionType": "original_commit_for_fix"
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    ]
  }
]