GHSA-677F-C75X-79M2

Vulnerability from github – Published: 2025-05-26 15:30 – Updated: 2025-12-16 21:30
VLAI?
Details

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.

Severity ?
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
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{
  "affected": [],
  "aliases": [
    "CVE-2025-37992"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-476"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-05-26T15:15:19Z",
    "severity": "MODERATE"
  },
  "details": "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.",
  "id": "GHSA-677f-c75x-79m2",
  "modified": "2025-12-16T21:30:49Z",
  "published": "2025-05-26T15:30:34Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-37992"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2d3cbfd6d54a2c39ce3244f33f85c595844bd7b8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a7d6e0ac0a8861f6b1027488062251a8e28150fd"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d1365ca80b012d8a7863e45949e413fb61fa4861"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d3336f746f196c6a53e0480923ae93939f047b6c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d38939ebe0d992d581acb6885c1723fa83c1fb2c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ea1132ccb112f51ba749c56a912f67970c2cd542"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fe88c7e4fc2c1cd75a278a15ffbf1689efad4e76"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2025/08/msg00010.html"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}


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