GHSA-CG86-M5XC-JQRM

Vulnerability from github – Published: 2025-02-18 15:31 – Updated: 2025-11-03 21:32
VLAI?
Details

In the Linux kernel, the following vulnerability has been resolved:

netem: Update sch->q.qlen before qdisc_tree_reduce_backlog()

qdisc_tree_reduce_backlog() notifies parent qdisc only if child qdisc becomes empty, therefore we need to reduce the backlog of the child qdisc before calling it. Otherwise it would miss the opportunity to call cops->qlen_notify(), in the case of DRR, it resulted in UAF since DRR uses ->qlen_notify() to maintain its active list.

Severity ?
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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{
  "affected": [],
  "aliases": [
    "CVE-2025-21703"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-416"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-02-18T15:15:18Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetem: Update sch-\u003eq.qlen before qdisc_tree_reduce_backlog()\n\nqdisc_tree_reduce_backlog() notifies parent qdisc only if child\nqdisc becomes empty, therefore we need to reduce the backlog of the\nchild qdisc before calling it. Otherwise it would miss the opportunity\nto call cops-\u003eqlen_notify(), in the case of DRR, it resulted in UAF\nsince DRR uses -\u003eqlen_notify() to maintain its active list.",
  "id": "GHSA-cg86-m5xc-jqrm",
  "modified": "2025-11-03T21:32:46Z",
  "published": "2025-02-18T15:31:09Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-21703"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1f8e3f4a4b8b90ad274dfbc66fc7d55cb582f4d5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6312555249082d6d8cc5321ff725df05482d8b83"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/638ba5089324796c2ee49af10427459c2de35f71"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7b79ca9a1de6a428d486ff52fb3d602321c08f55"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7f31d74fcc556a9166b1bb20515542de7bb939d1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/839ecc583fa00fab785fde1c85a326743657fd32"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/98a2c685293aae122f688cde11d9334dddc5d207"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e395fec75ac2dbffc99b4bce57b7f1f3c5449f2c"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00028.html"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}


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