fkie_cve-2025-38177
Vulnerability from fkie_nvd
Published
2025-07-04 13:15
Modified
2025-07-08 16:18
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
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0475c85426b18eccdcb7f9fb58d8f8e9c6c58c87
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/51eb3b65544c9efd6a1026889ee5fb5aa62da3bb
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9030a91235ae4845ec71902c3e0cecfc9ed1f2df
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c1175c4ad01dbc9c979d099861fa90a754f72059
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d06476714d2819b550e0cc39222347e2c8941c9d
Impacted products
Vendor Product Version


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{
  "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."
    }
  ],
  "id": "CVE-2025-38177",
  "lastModified": "2025-07-08T16:18:53.607",
  "metrics": {},
  "published": "2025-07-04T13:15:24.033",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "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"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Awaiting Analysis"
}


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