CVE-2026-98010 (GCVE-0-2026-98010)
Vulnerability from cvelistv5
Published
2026-09-25 10:23
Modified
2026-10-19 09:12
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: net/sched: drr: clamp quantum in change class drr_change_class() rejects explicit quantum==0 but falls back to psched_mtu() with no floor. With a crafted size table qdisc_pkt_len reaches ~2 GiB, so quantum=1 (or a zero psched_mtu on a headerless device) makes the deficit-refill loop spin under the qdisc lock. Add clamp_t(u32, quantum, 256, 1<<20) after the zero reject and on the fallback path. The explicit-zero reject is preserved. Conditions to recreate the bug: CONFIG_NET_SCH_DRR=y. Requires CAP_NET_ADMIN (namespace-local via unshare -Urn suffices). tc qdisc add dev dummy0 root drr tc class add dev dummy0 parent 1: classid 1:1 drr quantum 1
References
Impacted products
Vendor Product Version
Linux Linux Version: 13d2a1d2b032de08d7dcab6a1edcd47802681f96
Version: 13d2a1d2b032de08d7dcab6a1edcd47802681f96
Version: 13d2a1d2b032de08d7dcab6a1edcd47802681f96
Version: 13d2a1d2b032de08d7dcab6a1edcd47802681f96
Version: 13d2a1d2b032de08d7dcab6a1edcd47802681f96
Version: 13d2a1d2b032de08d7dcab6a1edcd47802681f96
Version: 13d2a1d2b032de08d7dcab6a1edcd47802681f96
Version: 13d2a1d2b032de08d7dcab6a1edcd47802681f96
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      "descriptions": [
        {
          "lang": "en",
          "value": "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\u003c\u003c20) 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"
        }
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      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:12:15.743Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/dc8b374214ef5bba4882bbd95b361e42555cfc0d"
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        },
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      "title": "net/sched: drr: clamp quantum in change class",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98010",
    "datePublished": "2026-09-25T10:23:34.738Z",
    "dateReserved": "2026-09-25T10:19:56.068Z",
    "dateUpdated": "2026-10-19T09:12:15.743Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.2"
}


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