fkie_cve-2025-37992
Vulnerability from fkie_nvd
Published
2025-05-26 15:15
Modified
2025-06-04 13:15
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: net_sched: Flush gso_skb list too during ->change() Previously, when reducing a qdisc's limit via the ->change() operation, only the main skb queue was trimmed, potentially leaving packets in the gso_skb list. This could result in NULL pointer dereference when we only check sch->limit against sch->q.qlen. This patch introduces a new helper, qdisc_dequeue_internal(), which ensures both the gso_skb list and the main queue are properly flushed when trimming excess packets. All relevant qdiscs (codel, fq, fq_codel, fq_pie, hhf, pie) are updated to use this helper in their ->change() routines.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2d3cbfd6d54a2c39ce3244f33f85c595844bd7b8
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a7d6e0ac0a8861f6b1027488062251a8e28150fd
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d1365ca80b012d8a7863e45949e413fb61fa4861
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d3336f746f196c6a53e0480923ae93939f047b6c
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d38939ebe0d992d581acb6885c1723fa83c1fb2c
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ea1132ccb112f51ba749c56a912f67970c2cd542
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/fe88c7e4fc2c1cd75a278a15ffbf1689efad4e76
Impacted products
Vendor Product Version


To clipboard 

{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet_sched: Flush gso_skb list too during -\u003echange()\n\nPreviously, when reducing a qdisc\u0027s limit via the -\u003echange() operation, only\nthe main skb queue was trimmed, potentially leaving packets in the gso_skb\nlist. This could result in NULL pointer dereference when we only check\nsch-\u003elimit against sch-\u003eq.qlen.\n\nThis patch introduces a new helper, qdisc_dequeue_internal(), which ensures\nboth the gso_skb list and the main queue are properly flushed when trimming\nexcess packets. All relevant qdiscs (codel, fq, fq_codel, fq_pie, hhf, pie)\nare updated to use this helper in their -\u003echange() routines."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net_sched: Vaciar tambi\u00e9n la lista gso_skb durante -\u0026gt;change(). Anteriormente, al reducir el l\u00edmite de una qdisc mediante la operaci\u00f3n -\u0026gt;change(), solo se recortaba la cola principal de skb, lo que pod\u00eda dejar paquetes en la lista gso_skb. Esto pod\u00eda provocar una desreferencia de puntero nulo al comparar \u00fanicamente sch-\u0026gt;limit con sch-\u0026gt;q.qlen. Este parche introduce un nuevo asistente, qdisc_dequeue_internal(), que garantiza que tanto la lista gso_skb como la cola principal se vac\u00eden correctamente al recortar los paquetes sobrantes. Todas las qdisc relevantes (codel, fq, fq_codel, fq_pie, hhf, pie) se han actualizado para usar este asistente en sus rutinas -\u0026gt;change()."
    }
  ],
  "id": "CVE-2025-37992",
  "lastModified": "2025-06-04T13:15:28.170",
  "metrics": {},
  "published": "2025-05-26T15:15:19.770",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/2d3cbfd6d54a2c39ce3244f33f85c595844bd7b8"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/a7d6e0ac0a8861f6b1027488062251a8e28150fd"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/d1365ca80b012d8a7863e45949e413fb61fa4861"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/d3336f746f196c6a53e0480923ae93939f047b6c"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/d38939ebe0d992d581acb6885c1723fa83c1fb2c"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/ea1132ccb112f51ba749c56a912f67970c2cd542"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/fe88c7e4fc2c1cd75a278a15ffbf1689efad4e76"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Awaiting Analysis"
}


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