{"id":"CVE-2026-98009","title":"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","summary":"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 cra…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33 < 99ae477b892e203a37985ebc56f0063e072f7f4b","Linux >= dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33 < 8f80b113dea0bed3c1a31a4224b72775cd9ec52d","Linux >= dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33 < de22c30ec5598aca8797f02082d2ee1358dfa3ff","Linux >= dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33 < 1c38487f46b243bfeefec0c0c86023a3904f2214","Linux 5.6"],"published":"2026-09-25","updated":"2026-09-25","sourceUpdated":"2026-09-25T11:17:29.210","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-98009","references":[{"url":"https://git.kernel.org/stable/c/1c38487f46b243bfeefec0c0c86023a3904f2214","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/8f80b113dea0bed3c1a31a4224b72775cd9ec52d","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/99ae477b892e203a37985ebc56f0063e072f7f4b","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/de22c30ec5598aca8797f02082d2ee1358dfa3ff","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd","cve.org"],"ingestedAt":"2026-09-25T11:06:38.859Z","slug":"CVE-2026-98009","body":"## Overview\n\nIn 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\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}