ghsa-wf68-85vc-c49w
Vulnerability from github
Published
2025-10-29 15:31
Modified
2025-11-02 15:30
Details

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

net/sched: sch_qfq: Fix null-deref in agg_dequeue

To prevent a potential crash in agg_dequeue (net/sched/sch_qfq.c) when cl->qdisc->ops->peek(cl->qdisc) returns NULL, we check the return value before using it, similar to the existing approach in sch_hfsc.c.

To avoid code duplication, the following changes are made:

  1. Changed qdisc_warn_nonwc(include/net/pkt_sched.h) into a static inline function.

  2. Moved qdisc_peek_len from net/sched/sch_hfsc.c to include/net/pkt_sched.h so that sch_qfq can reuse it.

  3. Applied qdisc_peek_len in agg_dequeue to avoid crashing.

Show details on source website

To clipboard 

{
  "affected": [],
  "aliases": [
    "CVE-2025-40083"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-10-29T14:15:54Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: sch_qfq: Fix null-deref in agg_dequeue\n\nTo prevent a potential crash in agg_dequeue (net/sched/sch_qfq.c)\nwhen cl-\u003eqdisc-\u003eops-\u003epeek(cl-\u003eqdisc) returns NULL, we check the return\nvalue before using it, similar to the existing approach in sch_hfsc.c.\n\nTo avoid code duplication, the following changes are made:\n\n1. Changed qdisc_warn_nonwc(include/net/pkt_sched.h) into a static\ninline function.\n\n2. Moved qdisc_peek_len from net/sched/sch_hfsc.c to\ninclude/net/pkt_sched.h so that sch_qfq can reuse it.\n\n3. Applied qdisc_peek_len in agg_dequeue to avoid crashing.",
  "id": "GHSA-wf68-85vc-c49w",
  "modified": "2025-11-02T15:30:12Z",
  "published": "2025-10-29T15:31:56Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-40083"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6ff8e74c8f8a68ec07ef837b95425dfe900d060f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6ffa9d66187188e3068b5a3895e6ae1ee34f9199"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/dd831ac8221e691e9e918585b1003c7071df0379"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.