ghsa-9pjq-r2xc-hgwc
Vulnerability from github
Published
2025-07-04 15:31
Modified
2025-07-04 15:31
Details

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

sch_hfsc: make hfsc_qlen_notify() idempotent

hfsc_qlen_notify() is not idempotent either and not friendly to its callers, like fq_codel_dequeue(). Let's make it idempotent to ease qdisc_tree_reduce_backlog() callers' life:

  1. update_vf() decreases cl->cl_nactive, so we can check whether it is non-zero before calling it.

  2. eltree_remove() always removes RB node cl->el_node, but we can use RB_EMPTY_NODE() + RB_CLEAR_NODE() to make it safe.

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{
  "affected": [],
  "aliases": [
    "CVE-2025-38177"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-07-04T13:15:24Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nsch_hfsc: make hfsc_qlen_notify() idempotent\n\nhfsc_qlen_notify() is not idempotent either and not friendly\nto its callers, like fq_codel_dequeue(). Let\u0027s make it idempotent\nto ease qdisc_tree_reduce_backlog() callers\u0027 life:\n\n1. update_vf() decreases cl-\u003ecl_nactive, so we can check whether it is\nnon-zero before calling it.\n\n2. eltree_remove() always removes RB node cl-\u003eel_node, but we can use\n   RB_EMPTY_NODE() + RB_CLEAR_NODE() to make it safe.",
  "id": "GHSA-9pjq-r2xc-hgwc",
  "modified": "2025-07-04T15:31:08Z",
  "published": "2025-07-04T15:31:08Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-38177"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0475c85426b18eccdcb7f9fb58d8f8e9c6c58c87"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/51eb3b65544c9efd6a1026889ee5fb5aa62da3bb"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9030a91235ae4845ec71902c3e0cecfc9ed1f2df"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c1175c4ad01dbc9c979d099861fa90a754f72059"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d06476714d2819b550e0cc39222347e2c8941c9d"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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