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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        }
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            "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."
          }
        ],
        "id": "CVE-2026-72326",
        "lastModified": "2026-08-17T06:18:36.153",
        "metrics": {},
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      "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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      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-01T13:30:10Z",
      "cve": "CVE-2026-72326",
      "id": "CVE-2026-72326",
      "initial_release_date": "2026-09-01T13:30:10Z",
      "product_status:known_affected": "228",
      "product_status:known_not_affected": "134",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-72326",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-72326.json",
      "version": "2"
    }
  }
}



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