{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2"
            },
            {
              "fixed": "86799499585af06a9431c9e7782658667bd62650"
            },
            {
              "fixed": "2017c355a5a1af77736cd1739fe922f69b5652dc"
            },
            {
              "fixed": "6581a82bf08ba5d4e2a6d4e3080df43315b296c4"
            },
            {
              "fixed": "9d782c662879c3adaaca30e05c36910ad11b9e54"
            },
            {
              "fixed": "d72dbdfaeb5b9b8d884e0e036c3442754379ef74"
            },
            {
              "fixed": "aeb8196ecb95146e3410f635628e6cd47352b3e5"
            },
            {
              "fixed": "da16c31517cd2c06bb2c78c73e91ae192c01c426"
            },
            {
              "fixed": "816e90057ab1879562a5b7cc688e35bb9027ae97"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.6.12"
            },
            {
              "fixed": "5.10.270"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.221"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.188"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.157"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.110"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.52"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.2.6"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90072.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: sfq: clamp quantum to avoid signed overflow soft lockup\n\nsfq_init() sets q-\u003equantum = psched_mtu(qdisc_dev(sch)) (unsigned). A\ndevice with a huge MTU (e.g. dummy with max_mtu == 0 accepting MTU\n2147483634) makes psched_mtu() return 0x80000000, so slot-\u003eallot = INT_MIN\nand INT_MIN + INT_MIN toggles between INT_MIN and 0 forever, spinning\nsfq_dequeue() under the qdisc lock.\n\nClamp the quantum to [256, 1 \u003c\u003c 20] so the refill loop terminates. The\nlower bound also covers q-\u003equantum == 0 (psched_mtu() returning 0),\nwhich spins sfq_dequeue() identically. sfq_change() already rejects a\nnegative quantum, so only the init path was exposed.\n\nConditions to recreate the bug: a device whose MTU (plus\nhard_header_len) wraps psched_mtu() into the sign bit (e.g. a dummy\ndevice with max_mtu == 0 accepting MTU 2147483634). Requires\nCAP_NET_ADMIN in a user namespace.",
  "id": "CVE-2026-90072",
  "modified": "2026-09-19T03:30:54.169954028Z",
  "published": "2026-09-17T16:05:52.905Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2017c355a5a1af77736cd1739fe922f69b5652dc"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6581a82bf08ba5d4e2a6d4e3080df43315b296c4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/816e90057ab1879562a5b7cc688e35bb9027ae97"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/86799499585af06a9431c9e7782658667bd62650"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9d782c662879c3adaaca30e05c36910ad11b9e54"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/aeb8196ecb95146e3410f635628e6cd47352b3e5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d72dbdfaeb5b9b8d884e0e036c3442754379ef74"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/da16c31517cd2c06bb2c78c73e91ae192c01c426"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90072.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-90072"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "net/sched: sfq: clamp quantum to avoid signed overflow soft lockup"
}