CVE-2026-98009

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-98009", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-25T10:19:56.068Z", "datePublished": "2026-09-25T10:23:34.144Z", "dateUpdated": "2026-10-19T09:12:14.751Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T09:12:14.751Z"}, "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"}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/sched/sch_ets.c"], "versions": [{"version": "dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33", "lessThan": "440b66cc7b56ea38e9b878ae88da91992efaa4c4", "status": "affected", "versionType": "git"}, {"version": "dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33", "lessThan": "4ef8664eafafc8db68a1d52601f17dc008a223b7", "status": "affected", "versionType": "git"}, {"version": "dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33", "lessThan": "8b8d782c3b96376217087767dcf662cd3d25f226", "status": "affected", "versionType": "git"}, {"version": "dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33", "lessThan": "226d2702e74a570f5bfae6115b4706da4b94e5cf", "status": "affected", "versionType": "git"}, {"version": "dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33", "lessThan": "99ae477b892e203a37985ebc56f0063e072f7f4b", "status": "affected", "versionType": "git"}, {"version": "dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33", "lessThan": "8f80b113dea0bed3c1a31a4224b72775cd9ec52d", "status": "affected", "versionType": "git"}, {"version": "dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33", "lessThan": "de22c30ec5598aca8797f02082d2ee1358dfa3ff", "status": "affected", "versionType": "git"}, {"version": "dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33", "lessThan": "1c38487f46b243bfeefec0c0c86023a3904f2214", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/sched/sch_ets.c"], "versions": [{"version": "5.6", "status": "affected"}, {"version": "0", "lessThan": "5.6", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.271", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.222", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.189", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.158", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.111", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.53", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.7", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.3", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.6", "versionEndExcluding": "5.10.271"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.6", "versionEndExcluding": "5.15.222"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.6", "versionEndExcluding": "6.1.189"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.6", "versionEndExcluding": "6.6.158"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.6", "versionEndExcluding": "6.12.111"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.6", "versionEndExcluding": "6.18.53"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.6", "versionEndExcluding": "7.2.7"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.6", "versionEndExcluding": "7.3"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/440b66cc7b56ea38e9b878ae88da91992efaa4c4"}, {"url": "https://git.kernel.org/stable/c/4ef8664eafafc8db68a1d52601f17dc008a223b7"}, {"url": "https://git.kernel.org/stable/c/8b8d782c3b96376217087767dcf662cd3d25f226"}, {"url": "https://git.kernel.org/stable/c/226d2702e74a570f5bfae6115b4706da4b94e5cf"}, {"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"}}}}

{}

{"affected": [{"affectedData": [{"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": "440b66cc7b56ea38e9b878ae88da91992efaa4c4", "status": "affected", "version": "dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33", "versionType": "git"}, {"lessThan": "4ef8664eafafc8db68a1d52601f17dc008a223b7", "status": "affected", "version": "dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33", "versionType": "git"}, {"lessThan": "8b8d782c3b96376217087767dcf662cd3d25f226", "status": "affected", "version": "dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33", "versionType": "git"}, {"lessThan": "226d2702e74a570f5bfae6115b4706da4b94e5cf", "status": "affected", "version": "dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33", "versionType": "git"}, {"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": "5.10.*", "status": "unaffected", "version": "5.10.271", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.222", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.189", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.158", "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", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "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"}], "id": "CVE-2026-98009", "lastModified": "2026-10-19T10:17:52.293", "metrics": {}, "published": "2026-09-25T11:17:29.210", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/1c38487f46b243bfeefec0c0c86023a3904f2214"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/226d2702e74a570f5bfae6115b4706da4b94e5cf"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/440b66cc7b56ea38e9b878ae88da91992efaa4c4"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/4ef8664eafafc8db68a1d52601f17dc008a223b7"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/8b8d782c3b96376217087767dcf662cd3d25f226"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/8f80b113dea0bed3c1a31a4224b72775cd9ec52d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/99ae477b892e203a37985ebc56f0063e072f7f4b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/de22c30ec5598aca8797f02082d2ee1358dfa3ff"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: net/sched: ets: clamp quantum in parse and fallback paths", "id": "2541140", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2541140"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-835", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nnet/sched: ets: clamp quantum in parse and fallback paths\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.\nMove the floor into ets_quantum_parse() so explicitly configured quanta\nare also clamped to [256, 1<<20], not just the fallback path.\nConditions to recreate the bug:\nCONFIG_NET_SCH_ETS=y. Requires CAP_NET_ADMIN (namespace-local via\nunshare -Urn suffices).\ntc qdisc add dev dummy0 root ets bands 3 strict 2 quanta 1 1", "A flaw was found in the Linux kernel's Enhanced Transmission Selection (ETS) network scheduler. A local user with network administration privileges, including an unprivileged user inside a user namespace, can configure traffic control queue disciplines with invalid or unconstrained quantum parameters. This flaw causes an internal deficit-refill loop to spin indefinitely while holding a scheduler lock, leading to a system hang and Denial of Service (DoS)."], "name": "CVE-2026-98009", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Fix deferred", "package_name": "openshift/ose-rhel-coreos-8", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Fix deferred", "package_name": "openshift/ose-rhel-coreos-9", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-09-25T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-98009\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-98009\nhttps://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98009.mbox"], "threat_severity": "Low"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33,99ae477b892e203a37985ebc56f0063e072f7f4b)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33,8f80b113dea0bed3c1a31a4224b72775cd9ec52d)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33,de22c30ec5598aca8797f02082d2ee1358dfa3ff)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33,1c38487f46b243bfeefec0c86023a3904f2214)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "5.6"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,5.6)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.111,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.53,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2.7,7.3.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.3-rc3,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-09-25T15:30:06.905940+00:00", "updated": "2026-09-30T14:30:18.594089+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}