{"id":"CVE-2026-98010","revision":"03f2bbfc7cb749b5b4c4956c9679ee27","records":[{"revision":"03f2bbfc7cb749b5b4c4956c9679ee27","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-98010","aliases":[],"title":"net/sched: drr: clamp quantum in change class","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: drr: clamp quantum in change class\n\ndrr_change_class() rejects explicit quantum==0 but falls back to\npsched_mtu() with no floor. With a crafted size table qdisc_pkt_len\nreaches ~2 GiB, so quantum=1 (or a zero psched_mtu on a headerless\ndevice) makes the deficit-refill loop spin under the qdisc lock.\n\nAdd clamp_t(u32, quantum, 256, 1<<20) after the zero reject and on the\nfallback path. The explicit-zero reject is preserved.\n\nConditions to recreate the bug:\n  CONFIG_NET_SCH_DRR=y. Requires CAP_NET_ADMIN (namespace-local via\n  unshare -Urn suffices).\n\n  tc qdisc add dev dummy0 root drr\n  tc class add dev dummy0 parent 1: classid 1:1 drr quantum 1","state":0,"publishedAt":"2026-09-25T10:23:34.738+00:00","modifiedAt":"2026-10-19T09:12:15.743+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_drr.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"13d2a1d2b032de08d7dcab6a1edcd47802681f96\",\n                            \"lessThan\": \"e2297bbf9cf6ece86f1d1f8c683517a994990f9e\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"13d2a1d2b032de08d7dcab6a1edcd47802681f96\",\n                            \"lessThan\": \"560794ee6e040b6e1c4ac2b3c8909f341a4596ee\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"13d2a1d2b032de08d7dcab6a1edcd47802681f96\",\n                            \"lessThan\": \"23fea7e6736b2e1c6f6f2f05cccf33d36834da73\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"13d2a1d2b032de08d7dcab6a1edcd47802681f96\",\n                            \"lessThan\": \"b464affe9f9dfe41ac48930c376e3fb8596651b0\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"13d2a1d2b032de08d7dcab6a1edcd47802681f96\",\n                            \"lessThan\": \"dc8b374214ef5bba4882bbd95b361e42555cfc0d\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"13d2a1d2b032de08d7dcab6a1edcd47802681f96\",\n                            \"lessThan\": \"d43cded350fe1218493ad3d37a276aff14108ae6\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"13d2a1d2b032de08d7dcab6a1edcd47802681f96\",\n                            \"lessThan\": \"8f756ae1c87414ce9cc21b30e6e4c036d6e9e80b\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"13d2a1d2b032de08d7dcab6a1edcd47802681f96\",\n                            \"lessThan\": \"8382abec0f1568d0a5590d75a3df92f23fcf5196\",\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_drr.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"2.6.29\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"2.6.29\",\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/e2297bbf9cf6ece86f1d1f8c683517a994990f9e","https://git.kernel.org/stable/c/560794ee6e040b6e1c4ac2b3c8909f341a4596ee","https://git.kernel.org/stable/c/23fea7e6736b2e1c6f6f2f05cccf33d36834da73","https://git.kernel.org/stable/c/b464affe9f9dfe41ac48930c376e3fb8596651b0","https://git.kernel.org/stable/c/dc8b374214ef5bba4882bbd95b361e42555cfc0d","https://git.kernel.org/stable/c/d43cded350fe1218493ad3d37a276aff14108ae6","https://git.kernel.org/stable/c/8f756ae1c87414ce9cc21b30e6e4c036d6e9e80b","https://git.kernel.org/stable/c/8382abec0f1568d0a5590d75a3df92f23fcf5196"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-98010","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-98010","identifiers":["CVE-2026-98010"]},"retained":false,"historicalAffected":[]}],"coverage":[]}