CVE-2025-38637

Estado: AnalizadaMedia (5.5)—

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

net_sched: skbprio: Remove overly strict queue assertions

In the current implementation, skbprio enqueue/dequeue contains an assertion that fails under certain conditions when SKBPRIO is used as a child qdisc under TBF with specific parameters. The failure occurs because TBF sometimes peeks at packets in the child qdisc without actually dequeuing them when tokens are unavailable.

This peek operation creates a discrepancy between the parent and child qdisc queue length counters. When TBF later receives a high-priority packet, SKBPRIO's queue length may show a different value than what's reflected in its internal priority queue tracking, triggering the assertion.

Leer descripción completaMostrar menos

The fix removes this overly strict assertions in SKBPRIO, they are not necessary at all.

CVSS

Versión: 3.1
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Puntuación base: 5.5

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.33%
Percentil entre todas las CVEs puntuadas: 24
Fecha de la puntuación: 6/10/2026

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (2)

Debian — Debian Linux Linux — Linux Kernel

CWE

CWE-617

Referencias

JSON original (NVD)

Mostrar

{
  "id": "CVE-2025-38637",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 5.5,
          "attackVector": "LOCAL",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 1.8
      }
    ]
  },
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "aea5f654e6b78a0c976f7a25950155932c77a53f",
              "lessThan": "7abc8318ce0712182bf0783dcfdd9a6a8331160e",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "aea5f654e6b78a0c976f7a25950155932c77a53f",
              "lessThan": "1284733bab736e598341f1d3f3b94e2a322864a8",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "aea5f654e6b78a0c976f7a25950155932c77a53f",
              "lessThan": "32ee79682315e6d3c99947b3f38b078a09a66919",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "aea5f654e6b78a0c976f7a25950155932c77a53f",
              "lessThan": "1dcc144c322a8d526b791135604c0663f1af9d85",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "aea5f654e6b78a0c976f7a25950155932c77a53f",
              "lessThan": "864ca690ff135078d374bd565b9872f161c614bc",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "aea5f654e6b78a0c976f7a25950155932c77a53f",
              "lessThan": "2f35b7673a3aa3d09b3eb05811669622ebaa98ca",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "aea5f654e6b78a0c976f7a25950155932c77a53f",
              "lessThan": "2286770b07cb5268c03d11274b8efd43dff0d380",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "aea5f654e6b78a0c976f7a25950155932c77a53f",
              "lessThan": "034b293bf17c124fec0f0e663f81203b00aa7a50",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "aea5f654e6b78a0c976f7a25950155932c77a53f",
              "lessThan": "ce8fe975fd99b49c29c42e50f2441ba53112b2e8",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "net/sched/sch_skbprio.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.19"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "4.19",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "5.4.292",
              "versionType": "semver",
              "lessThanOrEqual": "5.4.*"
            },
            {
              "status": "unaffected",
              "version": "5.10.236",
              "versionType": "semver",
              "lessThanOrEqual": "5.10.*"
            },
            {
              "status": "unaffected",
              "version": "5.15.180",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "status": "unaffected",
              "version": "6.1.134",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "status": "unaffected",
              "version": "6.6.87",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "status": "unaffected",
              "version": "6.12.23",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "status": "unaffected",
              "version": "6.13.11",
              "versionType": "semver",
              "lessThanOrEqual": "6.13.*"
            },
            {
              "status": "unaffected",
              "version": "6.14.2",
              "versionType": "semver",
              "lessThanOrEqual": "6.14.*"
            },
            {
              "status": "unaffected",
              "version": "6.15",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "net/sched/sch_skbprio.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2025-04-18T07:15:43.823",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/034b293bf17c124fec0f0e663f81203b00aa7a50",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/1284733bab736e598341f1d3f3b94e2a322864a8",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/1dcc144c322a8d526b791135604c0663f1af9d85",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/2286770b07cb5268c03d11274b8efd43dff0d380",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/2f35b7673a3aa3d09b3eb05811669622ebaa98ca",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/32ee79682315e6d3c99947b3f38b078a09a66919",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/7abc8318ce0712182bf0783dcfdd9a6a8331160e",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/864ca690ff135078d374bd565b9872f161c614bc",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/ce8fe975fd99b49c29c42e50f2441ba53112b2e8",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html",
      "tags": [
        "Third Party Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html",
      "tags": [
        "Third Party Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-617"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet_sched: skbprio: Remove overly strict queue assertions\n\nIn the current implementation, skbprio enqueue/dequeue contains an assertion\nthat fails under certain conditions when SKBPRIO is used as a child qdisc under\nTBF with specific parameters. The failure occurs because TBF sometimes peeks at\npackets in the child qdisc without actually dequeuing them when tokens are\nunavailable.\n\nThis peek operation creates a discrepancy between the parent and child qdisc\nqueue length counters. When TBF later receives a high-priority packet,\nSKBPRIO's queue length may show a different value than what's reflected in its\ninternal priority queue tracking, triggering the assertion.\n\nThe fix removes this overly strict assertions in SKBPRIO, they are not\nnecessary at all."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net_sched: skbprio: eliminar aserciones de cola demasiado estrictas En la implementación actual, skbprio enqueue/dequeue contiene una aserción que falla bajo ciertas condiciones cuando SKBPRIO se usa como una qdisc secundaria bajo TBF con parámetros específicos. El fallo se produce porque TBF a veces echa un vistazo a los paquetes en la qdisc secundaria sin realmente sacarlos de la cola cuando los tokens no están disponibles. Esta operación de vistazo crea una discrepancia entre los contadores de longitud de cola de la qdisc primaria y secundaria. Cuando TBF recibe posteriormente un paquete de alta prioridad, la longitud de cola de SKBPRIO puede mostrar un valor diferente al que se refleja en su seguimiento interno de cola de prioridad, lo que activa la aserción. La corrección elimina estas aserciones demasiado estrictas en SKBPRIO, no son necesarias en absoluto."
    }
  ],
  "lastModified": "2026-06-17T09:17:15.860",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "CD7A1C50-14CD-4ED8-A1DD-9CF78AEE7555",
              "versionEndExcluding": "5.4.292",
              "versionStartIncluding": "4.19"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "1DF46FB0-9163-4ABE-8CCA-32A497D4715B",
              "versionEndExcluding": "5.10.236",
              "versionStartIncluding": "5.5"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "D19801C8-3D18-405D-9989-E6C9B30255FA",
              "versionEndExcluding": "5.15.180",
              "versionStartIncluding": "5.11"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "3985DEC3-0437-4177-BC42-314AB575285A",
              "versionEndExcluding": "6.1.134",
              "versionStartIncluding": "5.16"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "EFF24260-49B1-4251-9477-C564CFDAD25B",
              "versionEndExcluding": "6.6.87",
              "versionStartIncluding": "6.2"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "26CAB76D-F00F-43CE-BEAD-7097F8FB1D6C",
              "versionEndExcluding": "6.12.23",
              "versionStartIncluding": "6.7"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "E7E864B0-8C00-4679-BA55-659B4C9C3AD3",
              "versionEndExcluding": "6.13.11",
              "versionStartIncluding": "6.13"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "FADAE5D8-4808-442C-B218-77B2CE8780A0",
              "versionEndExcluding": "6.14.2",
              "versionStartIncluding": "6.14"
            }
          ],
          "operator": "OR"
        }
      ]
    },
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "FA6FEEC2-9F11-4643-8827-749718254FED"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}