GHSA-79VC-V8QM-8X53

Vulnerability from github – Published: 2025-07-28 12:30 – Updated: 2026-05-12 15:30
VLAI
Details

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

net/sched: sch_qfq: Fix race condition on qfq_aggregate

A race condition can occur when 'agg' is modified in qfq_change_agg (called during qfq_enqueue) while other threads access it concurrently. For example, qfq_dump_class may trigger a NULL dereference, and qfq_delete_class may cause a use-after-free.

This patch addresses the issue by:

  1. Moved qfq_destroy_class into the critical section.

  2. Added sch_tree_lock protection to qfq_dump_class and qfq_dump_class_stats.

Severity
4.7 (Medium)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
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{
  "affected": [],
  "aliases": [
    "CVE-2025-38477"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-362"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-07-28T12:15:29Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: sch_qfq: Fix race condition on qfq_aggregate\n\nA race condition can occur when \u0027agg\u0027 is modified in qfq_change_agg\n(called during qfq_enqueue) while other threads access it\nconcurrently. For example, qfq_dump_class may trigger a NULL\ndereference, and qfq_delete_class may cause a use-after-free.\n\nThis patch addresses the issue by:\n\n1. Moved qfq_destroy_class into the critical section.\n\n2. Added sch_tree_lock protection to qfq_dump_class and\nqfq_dump_class_stats.",
  "id": "GHSA-79vc-v8qm-8x53",
  "modified": "2026-05-12T15:30:58Z",
  "published": "2025-07-28T12:30:35Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-38477"
    },
    {
      "type": "WEB",
      "url": "https://cert-portal.siemens.com/productcert/html/ssa-082556.html"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/466e10194ab81caa2ee6a332d33ba16bcceeeba6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5e28d5a3f774f118896aec17a3a20a9c5c9dfc64"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a6d735100f602c830c16d69fb6d780eebd8c9ae1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/aa7a22c4d678bf649fd3a1d27debec583563414d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c000a3a330d97f6c073ace5aa5faf94b9adb4b79"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c6df794000147a3a02f79984aada4ce83f8d0a1e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d841aa5518508ab195b6781ad0d73ee378d713dd"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fbe48f06e64134dfeafa89ad23387f66ebca3527"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}



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