net/sched: sch_cake: drop WARN_ON(1) for malformed packets in ACK filter

{
  "id": "4eee2ff6d7b289b1c931ad9eeb792e2afa2310bc2572a3d997e6eeb5f9770c64",
  "url": "https://osv.dev/vulnerability/CVE-2026-74704",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "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.",
    "evidence": "osv:CVE-2026-74704",
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    "severity": "high",
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          "type": "CVSS_V3",
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      "modified": "2026-10-28T02:30:49.601123687Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/0c4882bff34558d8d53fb04c3e96da5c327c7dc8",
        "https://git.kernel.org/stable/c/2504a76e5c0694e14e15562730e1339f2d9f9458",
        "https://git.kernel.org/stable/c/2a33516f9ef59ad11844d4fc152f889449b5daf3",
        "https://git.kernel.org/stable/c/a1ae353d8355407c1bea971d1c1af5e7f242bb7d",
        "https://git.kernel.org/stable/c/a4b52612004a5639c4bfc30ba93ba414b8326e2a",
        "https://git.kernel.org/stable/c/ae1b2f8e21a41e7c7e75511bea0c4ccc59ec1bd3",
        "https://git.kernel.org/stable/c/c1693b7844a6c06d31a565e5a494948034dfd235",
        "https://git.kernel.org/stable/c/cd2f1d9fe8a507c2dc86ad326fe221f121c47734",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74704.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-74704",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
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    "security_relevant": true,
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  "source_id": "core-osv",
  "document_id": 518080,
  "published_at": "2026-08-22T15:33:03.491+00:00"
}