CVE-2025-38477 (GCVE-0-2025-38477)
Vulnerability from cvelistv5
Published
2025-07-28 11:21
Modified
2025-07-28 11:21
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: net/sched: sch_qfq: Fix race condition on qfq_aggregate A race condition can occur when 'agg' is modified in qfq_change_agg (called during qfq_enqueue) while other threads access it concurrently. For example, qfq_dump_class may trigger a NULL dereference, and qfq_delete_class may cause a use-after-free. This patch addresses the issue by: 1. Moved qfq_destroy_class into the critical section. 2. Added sch_tree_lock protection to qfq_dump_class and qfq_dump_class_stats.
References
Impacted products
Vendor Product Version
Linux Linux Version: 462dbc9101acd38e92eda93c0726857517a24bbd
Version: 462dbc9101acd38e92eda93c0726857517a24bbd
Version: 462dbc9101acd38e92eda93c0726857517a24bbd
Version: 462dbc9101acd38e92eda93c0726857517a24bbd
Version: 462dbc9101acd38e92eda93c0726857517a24bbd
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{
  "containers": {
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/sched/sch_qfq.c"
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      "cpeApplicability": [
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      "descriptions": [
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: sch_qfq: Fix race condition on qfq_aggregate\n\nA race condition can occur when \u0027agg\u0027 is modified in qfq_change_agg\n(called during qfq_enqueue) while other threads access it\nconcurrently. For example, qfq_dump_class may trigger a NULL\ndereference, and qfq_delete_class may cause a use-after-free.\n\nThis patch addresses the issue by:\n\n1. Moved qfq_destroy_class into the critical section.\n\n2. Added sch_tree_lock protection to qfq_dump_class and\nqfq_dump_class_stats."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-07-28T11:21:38.319Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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      "references": [
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          "url": "https://git.kernel.org/stable/c/466e10194ab81caa2ee6a332d33ba16bcceeeba6"
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        {
          "url": "https://git.kernel.org/stable/c/5e28d5a3f774f118896aec17a3a20a9c5c9dfc64"
        }
      ],
      "title": "net/sched: sch_qfq: Fix race condition on qfq_aggregate",
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-38477",
    "datePublished": "2025-07-28T11:21:38.319Z",
    "dateReserved": "2025-04-16T04:51:24.021Z",
    "dateUpdated": "2025-07-28T11:21:38.319Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.1",
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  }
}


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