CVE-2026-98009 (GCVE-0-2026-98009)
Vulnerability from cvelistv5
Published
2026-09-25 10:23
Modified
2026-10-19 09:12
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: net/sched: ets: clamp quantum in parse and fallback paths ets_qdisc_change() falls back to psched_mtu() with no floor for bands without an explicit quantum. With a crafted size table qdisc_pkt_len reaches ~2 GiB, so a zero psched_mtu on a headerless device makes the deficit-refill loop spin under the qdisc lock. Move the floor into ets_quantum_parse() so explicitly configured quanta are also clamped to [256, 1<<20], not just the fallback path. Conditions to recreate the bug: CONFIG_NET_SCH_ETS=y. Requires CAP_NET_ADMIN (namespace-local via unshare -Urn suffices). tc qdisc add dev dummy0 root ets bands 3 strict 2 quanta 1 1
References
Impacted products
Vendor Product Version
Linux Linux Version: dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33
Version: dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33
Version: dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33
Version: dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33
Version: dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33
Version: dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33
Version: dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33
Version: dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33
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      "descriptions": [
        {
          "lang": "en",
          "value": "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"
        }
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      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:12:14.751Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/1c38487f46b243bfeefec0c0c86023a3904f2214"
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98009",
    "datePublished": "2026-09-25T10:23:34.144Z",
    "dateReserved": "2026-09-25T10:19:56.068Z",
    "dateUpdated": "2026-10-19T09:12:14.751Z",
    "state": "PUBLISHED"
  },
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}


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