{"api_version":"1","generated_at":"2026-10-01T18:35:08+00:00","cve":"CVE-2026-98009","urls":{"html":"https://cve.report/CVE-2026-98009","api":"https://cve.report/api/cve/CVE-2026-98009.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-98009","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-98009"},"summary":{"title":"net/sched: ets: clamp quantum in parse and fallback paths","description":"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","state":"PUBLISHED","assigner":"Linux","published_at":"2026-09-25 11:17:29","updated_at":"2026-09-25 11:17:29"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/99ae477b892e203a37985ebc56f0063e072f7f4b","name":"https://git.kernel.org/stable/c/99ae477b892e203a37985ebc56f0063e072f7f4b","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/8f80b113dea0bed3c1a31a4224b72775cd9ec52d","name":"https://git.kernel.org/stable/c/8f80b113dea0bed3c1a31a4224b72775cd9ec52d","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/1c38487f46b243bfeefec0c0c86023a3904f2214","name":"https://git.kernel.org/stable/c/1c38487f46b243bfeefec0c0c86023a3904f2214","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/de22c30ec5598aca8797f02082d2ee1358dfa3ff","name":"https://git.kernel.org/stable/c/de22c30ec5598aca8797f02082d2ee1358dfa3ff","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-98009","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98009","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33 99ae477b892e203a37985ebc56f0063e072f7f4b git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33 8f80b113dea0bed3c1a31a4224b72775cd9ec52d git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33 de22c30ec5598aca8797f02082d2ee1358dfa3ff git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33 1c38487f46b243bfeefec0c0c86023a3904f2214 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5.6","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.6 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.111 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.53 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2.7 7.2.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.3-rc3 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"98009","cve":"CVE-2026-98009","epss":"0.001680000","percentile":"0.053900000","score_date":"2026-09-27","updated_at":"2026-09-28 00:02:24"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["net/sched/sch_ets.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"99ae477b892e203a37985ebc56f0063e072f7f4b","status":"affected","version":"dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33","versionType":"git"},{"lessThan":"8f80b113dea0bed3c1a31a4224b72775cd9ec52d","status":"affected","version":"dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33","versionType":"git"},{"lessThan":"de22c30ec5598aca8797f02082d2ee1358dfa3ff","status":"affected","version":"dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33","versionType":"git"},{"lessThan":"1c38487f46b243bfeefec0c0c86023a3904f2214","status":"affected","version":"dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["net/sched/sch_ets.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"5.6"},{"lessThan":"5.6","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.111","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.53","versionType":"semver"},{"lessThanOrEqual":"7.2.*","status":"unaffected","version":"7.2.7","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.3-rc3","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.111","versionStartIncluding":"5.6","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.53","versionStartIncluding":"5.6","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2.7","versionStartIncluding":"5.6","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.3-rc3","versionStartIncluding":"5.6","vulnerable":true}],"negate":false,"operator":"OR"}]}],"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<<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"}],"providerMetadata":{"dateUpdated":"2026-09-25T10:23:34.144Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/99ae477b892e203a37985ebc56f0063e072f7f4b"},{"url":"https://git.kernel.org/stable/c/8f80b113dea0bed3c1a31a4224b72775cd9ec52d"},{"url":"https://git.kernel.org/stable/c/de22c30ec5598aca8797f02082d2ee1358dfa3ff"},{"url":"https://git.kernel.org/stable/c/1c38487f46b243bfeefec0c0c86023a3904f2214"}],"title":"net/sched: ets: clamp quantum in parse and fallback paths","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-98009","datePublished":"2026-09-25T10:23:34.144Z","dateReserved":"2026-09-25T10:19:56.068Z","dateUpdated":"2026-09-25T10:23:34.144Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-09-25 11:17:29","lastModifiedDate":"2026-09-25 11:17:29","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"98009","Ordinal":"1","Title":"net/sched: ets: clamp quantum in parse and fallback paths","CVE":"CVE-2026-98009","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"98009","Ordinal":"1","NoteData":"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","Type":"Description","Title":"net/sched: ets: clamp quantum in parse and fallback paths"}]}}}