CVE-2026-98009 (GCVE-0-2026-98009)

Vulnerability from cvelistv5 – Published: 2026-09-25 10:23 – Updated: 2026-10-19 09:12
VLAI
Title
net/sched: ets: clamp quantum in parse and fallback paths
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
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7097 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33 , < 440b66cc7b56ea38e9b878ae88da91992efaa4c4 (git)
Affected: dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33 , < 4ef8664eafafc8db68a1d52601f17dc008a223b7 (git)
Affected: dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33 , < 8b8d782c3b96376217087767dcf662cd3d25f226 (git)
Affected: dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33 , < 226d2702e74a570f5bfae6115b4706da4b94e5cf (git)
Affected: dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33 , < 99ae477b892e203a37985ebc56f0063e072f7f4b (git)
Affected: dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33 , < 8f80b113dea0bed3c1a31a4224b72775cd9ec52d (git)
Affected: dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33 , < de22c30ec5598aca8797f02082d2ee1358dfa3ff (git)
Affected: dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33 , < 1c38487f46b243bfeefec0c0c86023a3904f2214 (git)
guessed Create a notification for this product.
Linux Linux Affected: 5.6
Unaffected: 0 , < 5.6 (semver)
Unaffected: 5.10.271 , ≤ 5.10.* (semver)
Unaffected: 5.15.222 , ≤ 5.15.* (semver)
Unaffected: 6.1.189 , ≤ 6.1.* (semver)
Unaffected: 6.6.158 , ≤ 6.6.* (semver)
Unaffected: 6.12.111 , ≤ 6.12.* (semver)
Unaffected: 6.18.53 , ≤ 6.18.* (semver)
Unaffected: 7.2.7 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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          "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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    "datePublished": "2026-09-25T10:23:34.144Z",
    "dateReserved": "2026-09-25T10:19:56.068Z",
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      "title": "kernel: net/sched: ets: clamp quantum in parse and fallback paths",
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      "cve": "CVE-2026-98009",
      "id": "CVE-2026-98009",
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      "product_status:recommended": "4",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-98009",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-98009.json",
      "version": "3"
    }
  }
}



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