net/sched: defer qdisc freeing after failed creation

{
  "id": "6b7b60b8be9c9ec0feea3e4d3e9518e3ce4d809820427a776f4d473b55681abd",
  "url": "https://osv.dev/vulnerability/CVE-2026-98017",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "net/sched: defer qdisc freeing after failed creation",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: net/sched: defer qdisc freeing after failed creation An RTM_NEWQDISC request can make clsact bind a populated shared ingress block during ->init(), publishing an embedded mini_Qdisc to lockless readers. If the same request has an invalid TCA_RATE, estimator setup fails after ->init(); the unwind removes the pointer but synchronously frees its containing qdisc while tc_run() may still hold it. Retire failed qdiscs through the same RCU helper as normal destruction. Inline the synchronous free into the callback now that no direct callers remain.",
    "evidence": "osv:CVE-2026-98017",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
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            "value": "6.1.189",
            "evidence": "/affected/1/ranges"
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          {
            "value": "6.6.158",
            "evidence": "/affected/1/ranges"
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          {
            "value": "6.12.111",
            "evidence": "/affected/1/ranges"
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          {
            "value": "6.18.53",
            "evidence": "/affected/1/ranges"
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          {
            "value": "7.2.7",
            "evidence": "/affected/1/ranges"
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        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-98017",
      "aliases": [
        "CVE-2026-98017"
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      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
        }
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            "name": "Kernel",
            "ecosystem": "Linux"
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      ],
      "modified": "2026-10-28T02:30:37.839502310Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/156a3bab69744e9225bb9eff8c5cc53da18d5a2e",
        "https://git.kernel.org/stable/c/20bf6fa34b345333971bd4464a322cce87b83f4e",
        "https://git.kernel.org/stable/c/5bfe927c5b4b290fad529186218c728589b4b101",
        "https://git.kernel.org/stable/c/6a1b49bb9fdf9e8e7aa38e8cd635c0cc4074447d",
        "https://git.kernel.org/stable/c/96a27a3e64e7c87abade03fb2ad04ed66992a89a",
        "https://git.kernel.org/stable/c/e6662f2100f8d33b0f4d0047c219efd6bba186ea",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98017.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-98017",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98017.json"
      }
    },
    "related_cves": [
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        "value": "CVE-2026-98017",
        "evidence": "/id"
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    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 505362,
  "published_at": "2026-09-25T10:23:39.107+00:00"
}