CVE-2026-72326 (GCVE-0-2026-72326)
Vulnerability from cvelistv5
Published
2026-08-15 05:55
Modified
2026-08-17 05:12
Severity ?
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: a729b7f0bd5bf4919306556aed614438f5174537
Version: a729b7f0bd5bf4919306556aed614438f5174537
Version: a729b7f0bd5bf4919306556aed614438f5174537
Version: a729b7f0bd5bf4919306556aed614438f5174537
Version: a729b7f0bd5bf4919306556aed614438f5174537
Version: a729b7f0bd5bf4919306556aed614438f5174537
Version: a729b7f0bd5bf4919306556aed614438f5174537
Version: a729b7f0bd5bf4919306556aed614438f5174537
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{
  "containers": {
    "cna": {
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/sched/sch_cake.c"
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              "version": "0",
              "versionType": "semver"
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              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
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          "nodes": [
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              "cpeMatch": [
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              "negate": false,
              "operator": "OR"
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        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:12:32.814Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/f511dd7bf6077aa7afbe72914520553fedaacbb4"
        },
        {
          "url": "https://git.kernel.org/stable/c/e1df6cff03aad8c96e55a8b2a991e505c7a3ff6f"
        },
        {
          "url": "https://git.kernel.org/stable/c/297f459865360b46a887667cbf3aac6a6f013841"
        },
        {
          "url": "https://git.kernel.org/stable/c/336c1e414fc0e9844d445174e8ada2a7dd8d1c4b"
        },
        {
          "url": "https://git.kernel.org/stable/c/bcdf3a3664f7d2c4e37e155f30f72ef33f041804"
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          "url": "https://git.kernel.org/stable/c/7aa0e64fea778a9e3df73e64da95367ff8ad2ea5"
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          "url": "https://git.kernel.org/stable/c/f1e7807df5bf2d42a40266430e9f82f37633cdcf"
        },
        {
          "url": "https://git.kernel.org/stable/c/b7f97cae7ec1b6c3c32843c42be218690d310467"
        }
      ],
      "title": "net/sched: cake: reject overhead values that underflow length",
      "x_generator": {
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      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-72326",
    "datePublished": "2026-08-15T05:55:36.811Z",
    "dateReserved": "2026-08-09T03:40:39.919Z",
    "dateUpdated": "2026-08-17T05:12:32.814Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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