FKIE_CVE-2026-74704

Vulnerability from fkie_nvd - Published: 2026-08-22 16:16 - Updated: 2026-10-14 13:10
Severity
8.2 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: net/sched: sch_cake: drop WARN_ON(1) for malformed packets in ACK filter The sch_cake ACK filter parses packets to find the TCP header and filter duplicated ACKs if the flow is backlogged. The parsing code contains a WARN_ON(1) which can be triggered by a malformed IP header in certain cases. Depending on the system configuration, this leads either to either spamming dmesg with warnings, or a panic if panic_on_warn is set. The code already correctly skips the offending packet in the branch that triggers the warning, so the WARN_ON itself doesn't really serve any purpose. So just drop it altogether to avoid the inconvenient side effects.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0c4882bff34558d8d53fb04c3e96da5c327c7dc8
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2504a76e5c0694e14e15562730e1339f2d9f9458
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2a33516f9ef59ad11844d4fc152f889449b5daf3
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a1ae353d8355407c1bea971d1c1af5e7f242bb7d
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a4b52612004a5639c4bfc30ba93ba414b8326e2a
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ae1b2f8e21a41e7c7e75511bea0c4ccc59ec1bd3
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c1693b7844a6c06d31a565e5a494948034dfd235
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/cd2f1d9fe8a507c2dc86ad326fe221f121c47734
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/sched/sch_cake.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "c1693b7844a6c06d31a565e5a494948034dfd235",
              "status": "affected",
              "version": "8b7138814f29933898ecd31dfc83e35a30ee69f5",
              "versionType": "git"
            },
            {
              "lessThan": "a4b52612004a5639c4bfc30ba93ba414b8326e2a",
              "status": "affected",
              "version": "8b7138814f29933898ecd31dfc83e35a30ee69f5",
              "versionType": "git"
            },
            {
              "lessThan": "ae1b2f8e21a41e7c7e75511bea0c4ccc59ec1bd3",
              "status": "affected",
              "version": "8b7138814f29933898ecd31dfc83e35a30ee69f5",
              "versionType": "git"
            },
            {
              "lessThan": "0c4882bff34558d8d53fb04c3e96da5c327c7dc8",
              "status": "affected",
              "version": "8b7138814f29933898ecd31dfc83e35a30ee69f5",
              "versionType": "git"
            },
            {
              "lessThan": "2504a76e5c0694e14e15562730e1339f2d9f9458",
              "status": "affected",
              "version": "8b7138814f29933898ecd31dfc83e35a30ee69f5",
              "versionType": "git"
            },
            {
              "lessThan": "cd2f1d9fe8a507c2dc86ad326fe221f121c47734",
              "status": "affected",
              "version": "8b7138814f29933898ecd31dfc83e35a30ee69f5",
              "versionType": "git"
            },
            {
              "lessThan": "a1ae353d8355407c1bea971d1c1af5e7f242bb7d",
              "status": "affected",
              "version": "8b7138814f29933898ecd31dfc83e35a30ee69f5",
              "versionType": "git"
            },
            {
              "lessThan": "2a33516f9ef59ad11844d4fc152f889449b5daf3",
              "status": "affected",
              "version": "8b7138814f29933898ecd31dfc83e35a30ee69f5",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/sched/sch_cake.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.19"
            },
            {
              "lessThan": "4.19",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.265",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.216",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.183",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.152",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.104",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.45",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.9",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "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_cake: drop WARN_ON(1) for malformed packets in ACK filter\n\nThe sch_cake ACK filter parses packets to find the TCP header and filter\nduplicated ACKs if the flow is backlogged. The parsing code contains a\nWARN_ON(1) which can be triggered by a malformed IP header in certain\ncases. Depending on the system configuration, this leads either to\neither spamming dmesg with warnings, or a panic if panic_on_warn is set.\n\nThe code already correctly skips the offending packet in the branch that\ntriggers the warning, so the WARN_ON itself doesn\u0027t really serve any\npurpose. So just drop it altogether to avoid the inconvenient side\neffects."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nnet/sched: sch_cake: eliminar WARN_ON(1) para paquetes malformados en el filtro ACK\n\nEl filtro ACK de sch_cake analiza paquetes para encontrar la cabecera TCP y filtrar ACKs duplicados si el flujo est\u00e1 en cola. El c\u00f3digo de an\u00e1lisis contiene un WARN_ON(1) que puede ser activado por una cabecera IP malformada en ciertos casos. Dependiendo de la configuraci\u00f3n del sistema, esto lleva a inundar dmesg con advertencias, o a un p\u00e1nico si panic_on_warn est\u00e1 configurado.\n\nEl c\u00f3digo ya omite correctamente el paquete infractor en la rama que activa la advertencia, por lo que el propio WARN_ON realmente no cumple ning\u00fan prop\u00f3sito. As\u00ed que simplemente elim\u00ednalo por completo para evitar los efectos secundarios inconvenientes."
    }
  ],
  "id": "CVE-2026-74704",
  "lastModified": "2026-10-14T13:10:00.187",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 8.2,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "LOW",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 4.2,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-08-22T16:16:45.090",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/0c4882bff34558d8d53fb04c3e96da5c327c7dc8"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/2504a76e5c0694e14e15562730e1339f2d9f9458"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/2a33516f9ef59ad11844d4fc152f889449b5daf3"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/a1ae353d8355407c1bea971d1c1af5e7f242bb7d"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/a4b52612004a5639c4bfc30ba93ba414b8326e2a"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/ae1b2f8e21a41e7c7e75511bea0c4ccc59ec1bd3"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/c1693b7844a6c06d31a565e5a494948034dfd235"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/cd2f1d9fe8a507c2dc86ad326fe221f121c47734"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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