GHSA-5X69-69GJ-GG3F

Vulnerability from github – Published: 2026-08-22 18:30 – Updated: 2026-08-22 18:30
VLAI
Details

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.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-74704"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-22T16:16:45Z",
    "severity": null
  },
  "details": "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.",
  "id": "GHSA-5x69-69gj-gg3f",
  "modified": "2026-08-22T18:30:30Z",
  "published": "2026-08-22T18:30:29Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-74704"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0c4882bff34558d8d53fb04c3e96da5c327c7dc8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2504a76e5c0694e14e15562730e1339f2d9f9458"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2a33516f9ef59ad11844d4fc152f889449b5daf3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a1ae353d8355407c1bea971d1c1af5e7f242bb7d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a4b52612004a5639c4bfc30ba93ba414b8326e2a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ae1b2f8e21a41e7c7e75511bea0c4ccc59ec1bd3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c1693b7844a6c06d31a565e5a494948034dfd235"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/cd2f1d9fe8a507c2dc86ad326fe221f121c47734"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}



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