{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "ec97ecf1ebe485a17cd8395a5f35e6b80b57665a"
            },
            {
              "fixed": "f90fe65b977e7aa9eb302230a09eb18f8c32ceaa"
            },
            {
              "fixed": "c11e3a39807eb5a200445ae9082843ab86800415"
            },
            {
              "fixed": "6655b56e2801008566c594ef231f6c7b3f716c61"
            },
            {
              "fixed": "4864f58c53eb47257d55e01f47d4a9f355f7f970"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "5.6.0"
            },
            {
              "fixed": "6.12.111"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.53"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.2.7"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98013.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: fq_pie: clamp quantum in change path\n\nfq_pie_change() accepts any quantum value from userspace, including 1.\nWith a crafted size table qdisc_pkt_len reaches ~2 GiB, so quantum=1\nmakes the deficit-refill loop spin ~2^31 times under the qdisc lock\n(a soft lockup / denial of service).\n\nAdd max(256U, ...) matching fq_codel_change().\n\nConditions to recreate the bug:\n  CONFIG_NET_SCH_FQ_PIE=y. Requires CAP_NET_ADMIN (namespace-local via\n  unshare -Urn suffices).\n\n  tc qdisc add dev dummy0 root fq_pie\n  tc qdisc change dev dummy0 root fq_pie quantum 1 stab data 32768 size_log 15 cell_log 0",
  "id": "CVE-2026-98013",
  "modified": "2026-09-27T03:30:36.858814172Z",
  "published": "2026-09-25T10:23:36.527Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4864f58c53eb47257d55e01f47d4a9f355f7f970"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6655b56e2801008566c594ef231f6c7b3f716c61"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c11e3a39807eb5a200445ae9082843ab86800415"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f90fe65b977e7aa9eb302230a09eb18f8c32ceaa"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98013.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-98013"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "net/sched: fq_pie: clamp quantum in change path"
}