FKIE_CVE-2025-40083

Vulnerability from fkie_nvd - Published: 2025-10-29 14:15 - Updated: 2026-10-19 21:10
Severity
Summary
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.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1bed56f089f09b465420bf23bb32985c305cfc28
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3c2a8994807623c7655ece205667ae2cf74940aa
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6ff8e74c8f8a68ec07ef837b95425dfe900d060f
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6ffa9d66187188e3068b5a3895e6ae1ee34f9199
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/71d84658a61322e5630c85c5388fc25e4a2d08b2
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/99fc137f178797204d36ac860dd8b31e35baa2df
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/dd831ac8221e691e9e918585b1003c7071df0379
Impacted products
Vendor Product Version
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{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "include/net/pkt_sched.h",
            "net/sched/sch_api.c",
            "net/sched/sch_hfsc.c",
            "net/sched/sch_qfq.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "71d84658a61322e5630c85c5388fc25e4a2d08b2",
              "status": "affected",
              "version": "462dbc9101acd38e92eda93c0726857517a24bbd",
              "versionType": "git"
            },
            {
              "lessThan": "99fc137f178797204d36ac860dd8b31e35baa2df",
              "status": "affected",
              "version": "462dbc9101acd38e92eda93c0726857517a24bbd",
              "versionType": "git"
            },
            {
              "lessThan": "1bed56f089f09b465420bf23bb32985c305cfc28",
              "status": "affected",
              "version": "462dbc9101acd38e92eda93c0726857517a24bbd",
              "versionType": "git"
            },
            {
              "lessThan": "3c2a8994807623c7655ece205667ae2cf74940aa",
              "status": "affected",
              "version": "462dbc9101acd38e92eda93c0726857517a24bbd",
              "versionType": "git"
            },
            {
              "lessThan": "6ffa9d66187188e3068b5a3895e6ae1ee34f9199",
              "status": "affected",
              "version": "462dbc9101acd38e92eda93c0726857517a24bbd",
              "versionType": "git"
            },
            {
              "lessThan": "6ff8e74c8f8a68ec07ef837b95425dfe900d060f",
              "status": "affected",
              "version": "462dbc9101acd38e92eda93c0726857517a24bbd",
              "versionType": "git"
            },
            {
              "lessThan": "dd831ac8221e691e9e918585b1003c7071df0379",
              "status": "affected",
              "version": "462dbc9101acd38e92eda93c0726857517a24bbd",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "include/net/pkt_sched.h",
            "net/sched/sch_api.c",
            "net/sched/sch_hfsc.c",
            "net/sched/sch_qfq.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "3.8"
            },
            {
              "lessThan": "3.8",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.4.*",
              "status": "unaffected",
              "version": "5.4.302",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.247",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.197",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.159",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.116",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.57",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.16",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nnet/sched: sch_qfq: Correcci\u00f3n de desreferencia nula en agg_dequeue\n\nPara prevenir un posible fallo en agg_dequeue (net/sched/sch_qfq.c) cuando cl-\u003eqdisc-\u003eops-\u003epeek(cl-\u003eqdisc) devuelve NULL, verificamos el valor de retorno antes de usarlo, de forma similar al enfoque existente en sch_hfsc.c.\n\nPara evitar la duplicaci\u00f3n de c\u00f3digo, se realizan los siguientes cambios:\n\n1. Se cambi\u00f3 qdisc_warn_nonwc(include/net/pkt_sched.h) a una funci\u00f3n est\u00e1tica en l\u00ednea.\n\n2. Se movi\u00f3 qdisc_peek_len de net/sched/sch_hfsc.c a include/net/pkt_sched.h para que sch_qfq pueda reutilizarla.\n\n3. Se aplic\u00f3 qdisc_peek_len en agg_dequeue para evitar fallos."
    }
  ],
  "id": "CVE-2025-40083",
  "lastModified": "2026-10-19T21:10:00.160",
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2025-40083",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-06-16T19:42:58.130867Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2025-10-29T14:15:54.900",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/1bed56f089f09b465420bf23bb32985c305cfc28"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/3c2a8994807623c7655ece205667ae2cf74940aa"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/6ff8e74c8f8a68ec07ef837b95425dfe900d060f"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/6ffa9d66187188e3068b5a3895e6ae1ee34f9199"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/71d84658a61322e5630c85c5388fc25e4a2d08b2"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/99fc137f178797204d36ac860dd8b31e35baa2df"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/dd831ac8221e691e9e918585b1003c7071df0379"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Deferred"
}



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