ghsa-37v5-vmq6-f37g
Vulnerability from github
Published
2025-04-01 18:30
Modified
2025-04-10 15:31
Details

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

net_sched: Prevent creation of classes with TC_H_ROOT

The function qdisc_tree_reduce_backlog() uses TC_H_ROOT as a termination condition when traversing up the qdisc tree to update parent backlog counters. However, if a class is created with classid TC_H_ROOT, the traversal terminates prematurely at this class instead of reaching the actual root qdisc, causing parent statistics to be incorrectly maintained. In case of DRR, this could lead to a crash as reported by Mingi Cho.

Prevent the creation of any Qdisc class with classid TC_H_ROOT (0xFFFFFFFF) across all qdisc types, as suggested by Jamal.

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{
  "affected": [],
  "aliases": [
    "CVE-2025-21971"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-04-01T16:15:28Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet_sched: Prevent creation of classes with TC_H_ROOT\n\nThe function qdisc_tree_reduce_backlog() uses TC_H_ROOT as a termination\ncondition when traversing up the qdisc tree to update parent backlog\ncounters. However, if a class is created with classid TC_H_ROOT, the\ntraversal terminates prematurely at this class instead of reaching the\nactual root qdisc, causing parent statistics to be incorrectly maintained.\nIn case of DRR, this could lead to a crash as reported by Mingi Cho.\n\nPrevent the creation of any Qdisc class with classid TC_H_ROOT\n(0xFFFFFFFF) across all qdisc types, as suggested by Jamal.",
  "id": "GHSA-37v5-vmq6-f37g",
  "modified": "2025-04-10T15:31:44Z",
  "published": "2025-04-01T18:30:54Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-21971"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/003d92c91cdb5a64b25a9a74cb8543aac9a8bb48"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0c3057a5a04d07120b3d0ec9c79568fceb9c921e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5c3ca9cb48b51bd72bf76b8b05e24f3cd53db5e7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/78533c4a29ac3aeddce4b481770beaaa4f3bfb67"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7a82fe67a9f4d7123d8e5ba8f0f0806c28695006"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/94edfdfb9505ab608e86599d1d1e38c83816fc1c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e05d9938b1b0ac40b6054cc5fa0ccbd9afd5ed4c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e5ee00607bbfc97ef1526ea95b6b2458ac9e7cb7"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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