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

Vulnerability from cvelistv5 – Published: 2026-08-22 15:33 – Updated: 2026-08-22 15:33
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
No CVSS data available.
Assigner
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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          "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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-22T15:33:03.491Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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    "dateReserved": "2026-08-15T05:44:03.927Z",
    "dateUpdated": "2026-08-22T15:33:03.491Z",
    "state": "PUBLISHED"
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So just drop it altogether to avoid the inconvenient side\\neffects.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/sched/sch_cake.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"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\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/sched/sch_cake.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4.19\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"4.19\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.265\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.216\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.183\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.152\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.104\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.45\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.9\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"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\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.