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

Type: advisorySource: Official CVE List1 source record

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.

Announced Source revision 1
Original source ↗

CVE-2026-74704

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-74704

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "8b7138814f29933898ecd31dfc83e35a30ee69f5",
        "lessThan": "c1693b7844a6c06d31a565e5a494948034dfd235",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "8b7138814f29933898ecd31dfc83e35a30ee69f5",
        "lessThan": "a4b52612004a5639c4bfc30ba93ba414b8326e2a",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "8b7138814f29933898ecd31dfc83e35a30ee69f5",
        "lessThan": "ae1b2f8e21a41e7c7e75511bea0c4ccc59ec1bd3",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "8b7138814f29933898ecd31dfc83e35a30ee69f5",
        "lessThan": "0c4882bff34558d8d53fb04c3e96da5c327c7dc8",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "8b7138814f29933898ecd31dfc83e35a30ee69f5",
        "lessThan": "2504a76e5c0694e14e15562730e1339f2d9f9458",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "8b7138814f29933898ecd31dfc83e35a30ee69f5",
        "lessThan": "cd2f1d9fe8a507c2dc86ad326fe221f121c47734",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "8b7138814f29933898ecd31dfc83e35a30ee69f5",
        "lessThan": "a1ae353d8355407c1bea971d1c1af5e7f242bb7d",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "8b7138814f29933898ecd31dfc83e35a30ee69f5",
        "lessThan": "2a33516f9ef59ad11844d4fc152f889449b5daf3",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "net/sched/sch_cake.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": "5.10.265",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.216",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.183",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.152",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.104",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.45",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.1.9",
        "versionType": "semver",
        "lessThanOrEqual": "7.1.*"
      },
      {
        "status": "unaffected",
        "version": "7.2",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/sched/sch_cake.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-74704

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#34276 · Revision 1
Added to Heist Feed
Publisher date
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