CVE-2026-74704 (GCVE-0-2026-74704)

Vulnerability from cvelistv5 – Published: 2026-08-22 15:33 – Updated: 2026-08-25 05:41
VLAI
Title
net/sched: sch_cake: drop WARN_ON(1) for malformed packets in ACK filter
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.
Severity
8.2 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6667 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 8b7138814f29933898ecd31dfc83e35a30ee69f5 , < c1693b7844a6c06d31a565e5a494948034dfd235 (git)
Affected: 8b7138814f29933898ecd31dfc83e35a30ee69f5 , < a4b52612004a5639c4bfc30ba93ba414b8326e2a (git)
Affected: 8b7138814f29933898ecd31dfc83e35a30ee69f5 , < ae1b2f8e21a41e7c7e75511bea0c4ccc59ec1bd3 (git)
Affected: 8b7138814f29933898ecd31dfc83e35a30ee69f5 , < 0c4882bff34558d8d53fb04c3e96da5c327c7dc8 (git)
Affected: 8b7138814f29933898ecd31dfc83e35a30ee69f5 , < 2504a76e5c0694e14e15562730e1339f2d9f9458 (git)
Affected: 8b7138814f29933898ecd31dfc83e35a30ee69f5 , < cd2f1d9fe8a507c2dc86ad326fe221f121c47734 (git)
Affected: 8b7138814f29933898ecd31dfc83e35a30ee69f5 , < a1ae353d8355407c1bea971d1c1af5e7f242bb7d (git)
Affected: 8b7138814f29933898ecd31dfc83e35a30ee69f5 , < 2a33516f9ef59ad11844d4fc152f889449b5daf3 (git)
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Linux Linux Affected: 4.19
Unaffected: 0 , < 4.19 (semver)
Unaffected: 5.10.265 , ≤ 5.10.* (semver)
Unaffected: 5.15.216 , ≤ 5.15.* (semver)
Unaffected: 6.1.183 , ≤ 6.1.* (semver)
Unaffected: 6.6.152 , ≤ 6.6.* (semver)
Unaffected: 6.12.104 , ≤ 6.12.* (semver)
Unaffected: 6.18.45 , ≤ 6.18.* (semver)
Unaffected: 7.1.9 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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{
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          "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."
        }
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            "version": "3.1"
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              "value": "AV:N - The bug fires in cake_ack_filter() during cake_enqueue() on the packet datapath; remotely sourced traffic through an internet-facing SQM/OpenWrt gateway with CAKE ingress/egress and ack-filter enabled reaches the vulnerable ACK-filter parsing loop without any local syscall or netlink operation by the attacker.\nAC:L - Once CAKE ack-filter is configured, an attacker reliably crafts malformed encapsulated IP headers (e.g., IPv4 carrying an inner header with invalid version) and floods matching TCP ACKs to keep the flow backlogged, deterministically hitting the unsupported-version branch on each qualifying enqueue.\nPR:N - Installing CAKE with ack-filter requires CAP_NET_ADMIN, but triggering the bug on a preconfigured edge router or gateway needs no credentials on the target; an unauthenticated remote peer only sends crafted packets, consistent with CNA precedent for packet-driven tc issues (e.g., CVE-2026-72256).\nUI:N - Exploitation requires only attacker-generated packets delivered through the shaped interface; no victim login, file open, mount, or other interactive action is needed beyond normal network traffic reaching the CAKE-managed path.\nS:U - Impact is confined to kernel traffic-shaping code and warning/panic handling within the affected host; it does not cross VM, container, IOMMU, or other security-authority boundaries.\nC:L - Each WARN_ON(1) emits a kernel backtrace that can disclose kernel text and module pointers via dmesg/syslog to the attacker, constituting limited information disclosure even though no out-of-bounds read or use-after-free occurs.\nI:N - The failure path only executes continue and skips the malformed queued packet; there is no memory corruption, type confusion, or attacker-controlled modification of kernel or network data beyond normal ACK-filter drop behavior.\nA:H - Each matching malformed packet triggers WARN_ON(1) in cake_ack_filter(), flooding kernel warnings and, when panic_on_warn is enabled, invoking check_panic_on_warn() to kernel panic, yielding repeatable denial of service on CAKE-managed router and gateway paths."
            }
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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      "title": "net/sched: sch_cake: drop WARN_ON(1) for malformed packets in ACK filter",
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    "cveId": "CVE-2026-74704",
    "datePublished": "2026-08-22T15:33:03.491Z",
    "dateReserved": "2026-08-15T05:44:03.927Z",
    "dateUpdated": "2026-08-25T05:41:47.538Z",
    "state": "PUBLISHED"
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      "date": "2026-10-15",
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      "cve": "CVE-2026-74704",
      "id": "msrc_CVE-2026-74704",
      "initial_release_date": "2026-08-24T01:01:36.000Z",
      "product_status:fixed": "1",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "net/sched: sch_cake: drop WARN_ON(1) for malformed packets in ACK filter",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-74704.json",
      "version": "4"
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          {
            "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"
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          {
            "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"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-25T08:55:01+00:00",
      "cve": "CVE-2026-74704",
      "id": "CVE-2026-74704",
      "initial_release_date": "2026-08-22T00:00:00+00:00",
      "product_status:known_affected": "184",
      "product_status:known_not_affected": "90",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net/sched: sch_cake: drop WARN_ON(1) for malformed packets in ACK filter",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74704.json",
      "version": "3"
    }
  }
}



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