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CVE-2026-72326 (GCVE-0-2026-72326)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:55 – Updated: 2026-08-17 05:12
VLAI
Title
net/sched: cake: reject overhead values that underflow length
Summary
In the Linux kernel, the following vulnerability has been resolved: net/sched: cake: reject overhead values that underflow length CAKE accepts signed overhead values and stores them in an s16, but the adjusted packet length calculation uses unsigned arithmetic. A negative effective length can therefore wrap to a large value. Such configurations make rate accounting depend on integer wraparound rather than on the packet size userspace intended to model. A static netlink lower bound is not enough because packets reaching CAKE can be smaller than any reasonable manual-overhead allowance. Fold the signed overhead adjustment into the existing datapath MPU clamp so negative adjusted lengths are clamped before link-layer framing adjustments.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: a729b7f0bd5bf4919306556aed614438f5174537 , < f511dd7bf6077aa7afbe72914520553fedaacbb4 (git)
Affected: a729b7f0bd5bf4919306556aed614438f5174537 , < e1df6cff03aad8c96e55a8b2a991e505c7a3ff6f (git)
Affected: a729b7f0bd5bf4919306556aed614438f5174537 , < 297f459865360b46a887667cbf3aac6a6f013841 (git)
Affected: a729b7f0bd5bf4919306556aed614438f5174537 , < 336c1e414fc0e9844d445174e8ada2a7dd8d1c4b (git)
Affected: a729b7f0bd5bf4919306556aed614438f5174537 , < bcdf3a3664f7d2c4e37e155f30f72ef33f041804 (git)
Affected: a729b7f0bd5bf4919306556aed614438f5174537 , < 7aa0e64fea778a9e3df73e64da95367ff8ad2ea5 (git)
Affected: a729b7f0bd5bf4919306556aed614438f5174537 , < f1e7807df5bf2d42a40266430e9f82f37633cdcf (git)
Affected: a729b7f0bd5bf4919306556aed614438f5174537 , < b7f97cae7ec1b6c3c32843c42be218690d310467 (git)
guessed Create a notification for this product.
Linux Linux Affected: 4.19
Unaffected: 0 , < 4.19 (semver)
Unaffected: 5.10.261 , ≤ 5.10.* (semver)
Unaffected: 5.15.212 , ≤ 5.15.* (semver)
Unaffected: 6.1.178 , ≤ 6.1.* (semver)
Unaffected: 6.6.145 , ≤ 6.6.* (semver)
Unaffected: 6.12.97 , ≤ 6.12.* (semver)
Unaffected: 6.18.40 , ≤ 6.18.* (semver)
Unaffected: 7.1.5 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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    "dateReserved": "2026-08-09T03:40:39.919Z",
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A static\\nnetlink lower bound is not enough because packets reaching CAKE can be\\nsmaller than any reasonable manual-overhead allowance.\\n\\nFold the signed overhead adjustment into the existing datapath MPU clamp\\nso negative adjusted lengths are clamped before link-layer framing\\nadjustments.\"}],\"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\":\"a729b7f0bd5bf4919306556aed614438f5174537\",\"lessThan\":\"f511dd7bf6077aa7afbe72914520553fedaacbb4\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"a729b7f0bd5bf4919306556aed614438f5174537\",\"lessThan\":\"e1df6cff03aad8c96e55a8b2a991e505c7a3ff6f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"a729b7f0bd5bf4919306556aed614438f5174537\",\"lessThan\":\"297f459865360b46a887667cbf3aac6a6f013841\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"a729b7f0bd5bf4919306556aed614438f5174537\",\"lessThan\":\"336c1e414fc0e9844d445174e8ada2a7dd8d1c4b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"a729b7f0bd5bf4919306556aed614438f5174537\",\"lessThan\":\"bcdf3a3664f7d2c4e37e155f30f72ef33f041804\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"a729b7f0bd5bf4919306556aed614438f5174537\",\"lessThan\":\"7aa0e64fea778a9e3df73e64da95367ff8ad2ea5\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"a729b7f0bd5bf4919306556aed614438f5174537\",\"lessThan\":\"f1e7807df5bf2d42a40266430e9f82f37633cdcf\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"a729b7f0bd5bf4919306556aed614438f5174537\",\"lessThan\":\"b7f97cae7ec1b6c3c32843c42be218690d310467\",\"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\":\"5.10.261\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.212\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.178\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.145\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.97\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.40\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.5\",\"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/297f459865360b46a887667cbf3aac6a6f013841\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/336c1e414fc0e9844d445174e8ada2a7dd8d1c4b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7aa0e64fea778a9e3df73e64da95367ff8ad2ea5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b7f97cae7ec1b6c3c32843c42be218690d310467\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/bcdf3a3664f7d2c4e37e155f30f72ef33f041804\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e1df6cff03aad8c96e55a8b2a991e505c7a3ff6f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f1e7807df5bf2d42a40266430e9f82f37633cdcf\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f511dd7bf6077aa7afbe72914520553fedaacbb4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-08-19T05:25:49+00:00",
      "cve": "CVE-2026-72326",
      "id": "CVE-2026-72326",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_affected": "184",
      "product_status:known_not_affected": "90",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net/sched: cake: reject overhead values that underflow length",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-72326.json",
      "version": "3"
    }
  }
}



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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.