CVE-2025-21971 (GCVE-0-2025-21971)
Vulnerability from cvelistv5
Published
2025-04-01 15:47
Modified
2025-05-04 07:26
Severity ?
Summary
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.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/003d92c91cdb5a64b25a9a74cb8543aac9a8bb48
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0c3057a5a04d07120b3d0ec9c79568fceb9c921e
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5c3ca9cb48b51bd72bf76b8b05e24f3cd53db5e7
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/78533c4a29ac3aeddce4b481770beaaa4f3bfb67
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7a82fe67a9f4d7123d8e5ba8f0f0806c28695006
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/94edfdfb9505ab608e86599d1d1e38c83816fc1c
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e05d9938b1b0ac40b6054cc5fa0ccbd9afd5ed4c
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e5ee00607bbfc97ef1526ea95b6b2458ac9e7cb7
Impacted products
Vendor Product Version
Linux Linux Version: 066a3b5b2346febf9a655b444567b7138e3bb939
Version: 066a3b5b2346febf9a655b444567b7138e3bb939
Version: 066a3b5b2346febf9a655b444567b7138e3bb939
Version: 066a3b5b2346febf9a655b444567b7138e3bb939
Version: 066a3b5b2346febf9a655b444567b7138e3bb939
Version: 066a3b5b2346febf9a655b444567b7138e3bb939
Version: 066a3b5b2346febf9a655b444567b7138e3bb939
Version: 066a3b5b2346febf9a655b444567b7138e3bb939
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   Linux Linux Version: 2.6.25
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{
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      "cpeApplicability": [
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      "descriptions": [
        {
          "lang": "en",
          "value": "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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-05-04T07:26:09.021Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-21971",
    "datePublished": "2025-04-01T15:47:04.448Z",
    "dateReserved": "2024-12-29T08:45:45.797Z",
    "dateUpdated": "2025-05-04T07:26:09.021Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.1",
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  }
}


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