{"id":"CVE-2026-98009","revision":"22c0cfa39bf845ae83bf38ad3fbfa9f8","records":[{"revision":"22c0cfa39bf845ae83bf38ad3fbfa9f8","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-98009","aliases":[],"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":0,"publishedAt":"2026-09-25T10:23:34.144+00:00","modifiedAt":"2026-10-19T09:12:14.751+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"net/sched/sch_ets.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33\",\n                            \"lessThan\": \"440b66cc7b56ea38e9b878ae88da91992efaa4c4\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33\",\n                            \"lessThan\": \"4ef8664eafafc8db68a1d52601f17dc008a223b7\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33\",\n                            \"lessThan\": \"8b8d782c3b96376217087767dcf662cd3d25f226\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33\",\n                            \"lessThan\": \"226d2702e74a570f5bfae6115b4706da4b94e5cf\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33\",\n                            \"lessThan\": \"99ae477b892e203a37985ebc56f0063e072f7f4b\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33\",\n                            \"lessThan\": \"8f80b113dea0bed3c1a31a4224b72775cd9ec52d\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33\",\n                            \"lessThan\": \"de22c30ec5598aca8797f02082d2ee1358dfa3ff\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33\",\n                            \"lessThan\": \"1c38487f46b243bfeefec0c0c86023a3904f2214\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"net/sched/sch_ets.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"5.6\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"5.6\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.271\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.222\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.189\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.158\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.111\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.53\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.7\",\n                            \"lessThanOrEqual\": \"7.2.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.3\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[],"references":["https://git.kernel.org/stable/c/440b66cc7b56ea38e9b878ae88da91992efaa4c4","https://git.kernel.org/stable/c/4ef8664eafafc8db68a1d52601f17dc008a223b7","https://git.kernel.org/stable/c/8b8d782c3b96376217087767dcf662cd3d25f226","https://git.kernel.org/stable/c/226d2702e74a570f5bfae6115b4706da4b94e5cf","https://git.kernel.org/stable/c/99ae477b892e203a37985ebc56f0063e072f7f4b","https://git.kernel.org/stable/c/8f80b113dea0bed3c1a31a4224b72775cd9ec52d","https://git.kernel.org/stable/c/de22c30ec5598aca8797f02082d2ee1358dfa3ff","https://git.kernel.org/stable/c/1c38487f46b243bfeefec0c0c86023a3904f2214"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-98009","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-98009","identifiers":["CVE-2026-98009"]},"retained":false,"historicalAffected":[]}],"coverage":[]}