CVE-2025-38177 (GCVE-0-2025-38177)
Vulnerability from cvelistv5
Published
2025-07-04 12:47
Modified
2025-07-04 12:47
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: sch_hfsc: make hfsc_qlen_notify() idempotent hfsc_qlen_notify() is not idempotent either and not friendly to its callers, like fq_codel_dequeue(). Let's make it idempotent to ease qdisc_tree_reduce_backlog() callers' life: 1. update_vf() decreases cl->cl_nactive, so we can check whether it is non-zero before calling it. 2. eltree_remove() always removes RB node cl->el_node, but we can use RB_EMPTY_NODE() + RB_CLEAR_NODE() to make it safe.
References
Impacted products
Vendor Product Version
Linux Linux Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/sched/sch_hfsc.c"
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          "vendor": "Linux",
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            "net/sched/sch_hfsc.c"
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.138",
              "versionType": "semver"
            },
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              "status": "unaffected",
              "version": "6.6.90",
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              "version": "6.12.28",
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              "version": "6.14.6",
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              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.15",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
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              ],
              "negate": false,
              "operator": "OR"
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsch_hfsc: make hfsc_qlen_notify() idempotent\n\nhfsc_qlen_notify() is not idempotent either and not friendly\nto its callers, like fq_codel_dequeue(). Let\u0027s make it idempotent\nto ease qdisc_tree_reduce_backlog() callers\u0027 life:\n\n1. update_vf() decreases cl-\u003ecl_nactive, so we can check whether it is\nnon-zero before calling it.\n\n2. eltree_remove() always removes RB node cl-\u003eel_node, but we can use\n   RB_EMPTY_NODE() + RB_CLEAR_NODE() to make it safe."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-07-04T12:47:09.127Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/0475c85426b18eccdcb7f9fb58d8f8e9c6c58c87"
        },
        {
          "url": "https://git.kernel.org/stable/c/9030a91235ae4845ec71902c3e0cecfc9ed1f2df"
        },
        {
          "url": "https://git.kernel.org/stable/c/d06476714d2819b550e0cc39222347e2c8941c9d"
        },
        {
          "url": "https://git.kernel.org/stable/c/c1175c4ad01dbc9c979d099861fa90a754f72059"
        },
        {
          "url": "https://git.kernel.org/stable/c/51eb3b65544c9efd6a1026889ee5fb5aa62da3bb"
        }
      ],
      "title": "sch_hfsc: make hfsc_qlen_notify() idempotent",
      "x_generator": {
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    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-38177",
    "datePublished": "2025-07-04T12:47:09.127Z",
    "dateReserved": "2025-04-16T04:51:23.992Z",
    "dateUpdated": "2025-07-04T12:47:09.127Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-38177\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-07-04T13:15:24.033\",\"lastModified\":\"2025-07-08T16:18:53.607\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nsch_hfsc: make hfsc_qlen_notify() idempotent\\n\\nhfsc_qlen_notify() is not idempotent either and not friendly\\nto its callers, like fq_codel_dequeue(). Let\u0027s make it idempotent\\nto ease qdisc_tree_reduce_backlog() callers\u0027 life:\\n\\n1. update_vf() decreases cl-\u003ecl_nactive, so we can check whether it is\\nnon-zero before calling it.\\n\\n2. eltree_remove() always removes RB node cl-\u003eel_node, but we can use\\n   RB_EMPTY_NODE() + RB_CLEAR_NODE() to make it safe.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: sch_hfsc: hace que hfsc_qlen_notify() sea idempotente. hfsc_qlen_notify() tampoco es idempotente y no es compatible con quienes lo llaman, como fq_codel_dequeue(). Vamos a convertirlo en idempotente para simplificar la tarea de quienes llaman a qdisc_tree_reduce_backlog(): 1. update_vf() reduce cl-\u0026gt;cl_nactive, lo que permite comprobar si es distinto de cero antes de llamarlo. 2. eltree_remove() siempre elimina el nodo RB cl-\u0026gt;el_node, pero podemos usar RB_EMPTY_NODE() + RB_CLEAR_NODE() para hacerlo seguro.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0475c85426b18eccdcb7f9fb58d8f8e9c6c58c87\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/51eb3b65544c9efd6a1026889ee5fb5aa62da3bb\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9030a91235ae4845ec71902c3e0cecfc9ed1f2df\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c1175c4ad01dbc9c979d099861fa90a754f72059\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d06476714d2819b550e0cc39222347e2c8941c9d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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