{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33"
            },
            {
              "fixed": "99ae477b892e203a37985ebc56f0063e072f7f4b"
            },
            {
              "fixed": "8f80b113dea0bed3c1a31a4224b72775cd9ec52d"
            },
            {
              "fixed": "de22c30ec5598aca8797f02082d2ee1358dfa3ff"
            },
            {
              "fixed": "1c38487f46b243bfeefec0c0c86023a3904f2214"
            }
          ],
          "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-2026-98009.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: ets: clamp quantum in parse and fallback paths\n\nets_qdisc_change() falls back to psched_mtu() with no floor for bands\nwithout an explicit quantum. With a crafted size table qdisc_pkt_len\nreaches ~2 GiB, so a zero psched_mtu on a headerless device makes the\ndeficit-refill loop spin under the qdisc lock.\n\nMove the floor into ets_quantum_parse() so explicitly configured quanta\nare also clamped to [256, 1\u003c\u003c20], not just the fallback path.\n\nConditions to recreate the bug:\n  CONFIG_NET_SCH_ETS=y. Requires CAP_NET_ADMIN (namespace-local via\n  unshare -Urn suffices).\n\n  tc qdisc add dev dummy0 root ets bands 3 strict 2 quanta 1 1",
  "id": "CVE-2026-98009",
  "modified": "2026-09-27T03:30:43.791759516Z",
  "published": "2026-09-25T10:23:34.144Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1c38487f46b243bfeefec0c0c86023a3904f2214"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8f80b113dea0bed3c1a31a4224b72775cd9ec52d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/99ae477b892e203a37985ebc56f0063e072f7f4b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/de22c30ec5598aca8797f02082d2ee1358dfa3ff"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98009.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-98009"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "net/sched: ets: clamp quantum in parse and fallback paths"
}