GHSA-M5HH-PP2G-6F3P
Vulnerability from github – Published: 2026-09-25 12:31 – Updated: 2026-09-25 12:31In 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
{
"affected": [],
"aliases": [
"CVE-2026-98010"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-09-25T11:17:29Z",
"severity": null
},
"details": "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",
"id": "GHSA-m5hh-pp2g-6f3p",
"modified": "2026-09-25T12:31:32Z",
"published": "2026-09-25T12:31:32Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-98010"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/8382abec0f1568d0a5590d75a3df92f23fcf5196"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/8f756ae1c87414ce9cc21b30e6e4c036d6e9e80b"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/d43cded350fe1218493ad3d37a276aff14108ae6"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/dc8b374214ef5bba4882bbd95b361e42555cfc0d"
}
],
"schema_version": "1.4.0",
"severity": []
}
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