{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-98009",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2026-98009"
  ],
  "published": "2026-09-25T10:24:31Z",
  "summary": "net/sched: ets: clamp quantum in parse and fallback paths",
  "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<<20], 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",
  "affected": [
    {
      "package": {
        "ecosystem": "Raspberry Pi OS:12",
        "name": "linux"
      },
      "versions": [
        "1:6.1.47-1+rpt4"
      ],
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-2712",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v6",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7l",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v8",
            "binary_version": "1:6.1.47-1+rpt4"
          }
        ]
      },
      "database_specific": {
        "per_version": {
          "1:6.1.47-1+rpt4": {
            "linux_commit": "655fc658a15ae7a6f37103754adb39ba52a9a14e",
            "upstream_version": "6.1.47",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.1.189",
            "compiled_filter": false
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-98009"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/440b66cc7b56ea38e9b878ae88da91992efaa4c4"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/4ef8664eafafc8db68a1d52601f17dc008a223b7"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/8b8d782c3b96376217087767dcf662cd3d25f226"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/226d2702e74a570f5bfae6115b4706da4b94e5cf"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/99ae477b892e203a37985ebc56f0063e072f7f4b"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/8f80b113dea0bed3c1a31a4224b72775cd9ec52d"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/de22c30ec5598aca8797f02082d2ee1358dfa3ff"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/1c38487f46b243bfeefec0c0c86023a3904f2214"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-10-03T11:04:09Z"
  }
}