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GHSA-MQFM-GM6R-72RV

Vulnerability from github – Published: 2026-08-15 06:32 – Updated: 2026-08-15 06:32
VLAI
Details

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.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-72326"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-15T06:22:05Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: cake: reject overhead values that underflow length\n\nCAKE accepts signed overhead values and stores them in an s16, but the\nadjusted packet length calculation uses unsigned arithmetic.  A negative\neffective length can therefore wrap to a large value.\n\nSuch configurations make rate accounting depend on integer wraparound\nrather than on the packet size userspace intended to model.  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.",
  "id": "GHSA-mqfm-gm6r-72rv",
  "modified": "2026-08-15T06:32:20Z",
  "published": "2026-08-15T06:32:20Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-72326"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/297f459865360b46a887667cbf3aac6a6f013841"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/336c1e414fc0e9844d445174e8ada2a7dd8d1c4b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7aa0e64fea778a9e3df73e64da95367ff8ad2ea5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b7f97cae7ec1b6c3c32843c42be218690d310467"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bcdf3a3664f7d2c4e37e155f30f72ef33f041804"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e1df6cff03aad8c96e55a8b2a991e505c7a3ff6f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f1e7807df5bf2d42a40266430e9f82f37633cdcf"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f511dd7bf6077aa7afbe72914520553fedaacbb4"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}



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