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CVE-2025-37798 (GCVE-0-2025-37798)

Vulnerability from cvelistv5 – Published: 2025-05-02 14:16 – Updated: 2026-08-05 11:57
VLAI
Title
codel: remove sch->q.qlen check before qdisc_tree_reduce_backlog()
Summary
In the Linux kernel, the following vulnerability has been resolved: codel: remove sch->q.qlen check before qdisc_tree_reduce_backlog() After making all ->qlen_notify() callbacks idempotent, now it is safe to remove the check of qlen!=0 from both fq_codel_dequeue() and codel_qdisc_dequeue().
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 76e3cc126bb223013a6b9a0e2a51238d1ef2e409 , < 7a742a9506849d1c1aa71e36c89855ceddc7d58e (git)
Affected: 76e3cc126bb223013a6b9a0e2a51238d1ef2e409 , < cc71a757da78dd4aa1b4a9b19cb011833730ccf2 (git)
Affected: 76e3cc126bb223013a6b9a0e2a51238d1ef2e409 , < eda741fe155ddf5ecd2dd3bfbd4fc3c0c7dbb450 (git)
Affected: 76e3cc126bb223013a6b9a0e2a51238d1ef2e409 , < 829c49b6b2ff45b043739168fd1245e4e1a91a30 (git)
Affected: 76e3cc126bb223013a6b9a0e2a51238d1ef2e409 , < 2f9761a94bae33d26e6a81b31b36e7d776d93dc1 (git)
Affected: 76e3cc126bb223013a6b9a0e2a51238d1ef2e409 , < 4d55144b12e742404bb3f8fee6038bafbf45619d (git)
Affected: 76e3cc126bb223013a6b9a0e2a51238d1ef2e409 , < e73c838c80dccb9e4f19becc11d9f3cb4a27d483 (git)
Affected: 76e3cc126bb223013a6b9a0e2a51238d1ef2e409 , < a57fe60ef4cf96bfbb6b58397ec28bdb5a5c6b31 (git)
Affected: 76e3cc126bb223013a6b9a0e2a51238d1ef2e409 , < 342debc12183b51773b3345ba267e9263bdfaaef (git)
guessed Create a notification for this product.
Linux Linux Affected: 3.5
Unaffected: 0 , < 3.5 (semver)
Unaffected: 5.4.297 , ≤ 5.4.* (semver)
Unaffected: 5.10.241 , ≤ 5.10.* (semver)
Unaffected: 5.15.190 , ≤ 5.15.* (semver)
Unaffected: 6.1.135 , ≤ 6.1.* (semver)
Unaffected: 6.6.88 , ≤ 6.6.* (semver)
Unaffected: 6.12.24 , ≤ 6.12.* (semver)
Unaffected: 6.13.12 , ≤ 6.13.* (semver)
Unaffected: 6.14.3 , ≤ 6.14.* (semver)
Unaffected: 6.15 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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                    "matchCriteriaId": "483E2E15-2135-4EC6-AB64-16282C5EF704",
                    "versionEndExcluding": "6.14.3",
                    "versionStartIncluding": "6.14",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:linux:linux_kernel:6.15:rc1:*:*:*:*:*:*",
                    "matchCriteriaId": "8D465631-2980-487A-8E65-40AE2B9F8ED1",
                    "vulnerable": true
                  }
                ],
                "negate": false,
                "operator": "OR"
              }
            ]
          },
          {
            "nodes": [
              {
                "cpeMatch": [
                  {
                    "criteria": "cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*",
                    "matchCriteriaId": "FA6FEEC2-9F11-4643-8827-749718254FED",
                    "vulnerable": true
                  }
                ],
                "negate": false,
                "operator": "OR"
              }
            ]
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncodel: remove sch-\u003eq.qlen check before qdisc_tree_reduce_backlog()\n\nAfter making all -\u003eqlen_notify() callbacks idempotent, now it is safe to\nremove the check of qlen!=0 from both fq_codel_dequeue() and\ncodel_qdisc_dequeue()."
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: codel: eliminar la comprobaci\u00f3n de sch-\u0026gt;q.qlen antes de qdisc_tree_reduce_backlog() Despu\u00e9s de hacer que todas las devoluciones de llamadas -\u0026gt;qlen_notify() sean idempotentes, ahora es seguro eliminar la comprobaci\u00f3n de qlen!=0 de fq_codel_dequeue() y codel_qdisc_dequeue()."
          }
        ],
        "id": "CVE-2025-37798",
        "lastModified": "2026-07-30T06:22:20.747",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 7.8,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 1.8,
              "impactScore": 5.9,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
            },
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 7.8,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 1.8,
              "impactScore": 5.9,
              "source": "nvd@nist.gov",
              "type": "Primary"
            }
          ]
        },
        "published": "2025-05-02T15:15:48.657",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/2f9761a94bae33d26e6a81b31b36e7d776d93dc1"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/342debc12183b51773b3345ba267e9263bdfaaef"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/4d55144b12e742404bb3f8fee6038bafbf45619d"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
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            "url": "https://git.kernel.org/stable/c/7a742a9506849d1c1aa71e36c89855ceddc7d58e"
          },
          {
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            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/829c49b6b2ff45b043739168fd1245e4e1a91a30"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/a57fe60ef4cf96bfbb6b58397ec28bdb5a5c6b31"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/cc71a757da78dd4aa1b4a9b19cb011833730ccf2"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/e73c838c80dccb9e4f19becc11d9f3cb4a27d483"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/eda741fe155ddf5ecd2dd3bfbd4fc3c0c7dbb450"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "tags": [
              "Issue Tracking",
              "Third Party Advisory"
            ],
            "url": "https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "tags": [
              "Issue Tracking",
              "Third Party Advisory"
            ],
            "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Modified",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "NVD-CWE-noinfo"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-07-30T09:27:55+00:00",
      "cve": "CVE-2025-37798",
      "id": "CVE-2025-37798",
      "initial_release_date": "2025-05-02T00:00:00+00:00",
      "product_status:known_affected": "260",
      "product_status:known_not_affected": "14",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: codel: remove sch-\u003eq.qlen check before qdisc_tree_reduce_backlog()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-37798.json",
      "version": "3"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.