{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-98011",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2026-09-25T10:19:56.069Z",
        "datePublished": "2026-09-25T10:23:35.338Z",
        "dateUpdated": "2026-10-19T09:12:16.718Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-10-19T09:12:16.718Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: hhf: clamp quantum in change and init paths\n\nhhf_change() accepts any quantum from userspace, including 1. With a\ncrafted size table qdisc_pkt_len reaches ~2 GiB, so quantum=1 makes\nthe deficit-refill loop spin ~2^31 times under the qdisc lock\n(a soft lockup / denial of service).\n\nAdd max(256U, ...) in hhf_change() matching fq_codel_change(). Clamp\nhhf_init() to [256, 1<<20] matching the siblings, and remove the old\nfallback that only set quantum=256 on overflow.\n\nConditions to recreate the bug:\n  CONFIG_NET_SCH_HHF=y. Requires CAP_NET_ADMIN (namespace-local via\n  unshare -Urn suffices).\n\n  tc qdisc add dev dummy0 root hhf\n  tc qdisc change dev dummy0 root hhf quantum 1 stab data 32768 size_log 15 cell_log 0"
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "net/sched/sch_hhf.c"
                    ],
                    "versions": [
                        {
                            "version": "10239edf86f137ce4c39b62ea9575e8053c549a0",
                            "lessThan": "a328698d046098e6f55b3b1460cac6bab577be58",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "10239edf86f137ce4c39b62ea9575e8053c549a0",
                            "lessThan": "c364ad3ab3c8a6bce469a5cbf02881ab1324c5da",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "10239edf86f137ce4c39b62ea9575e8053c549a0",
                            "lessThan": "2c6dd9fc86d446a03728c43f3b96d9ae29aa058f",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "10239edf86f137ce4c39b62ea9575e8053c549a0",
                            "lessThan": "6570f326a6a96bedf3d1d1dab6acc9f8c29104ec",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "10239edf86f137ce4c39b62ea9575e8053c549a0",
                            "lessThan": "1113b674307ffddd402524bd1fd9d7d5629b705b",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "10239edf86f137ce4c39b62ea9575e8053c549a0",
                            "lessThan": "2e77947bbf6c166e76c038663832d0914418f761",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "10239edf86f137ce4c39b62ea9575e8053c549a0",
                            "lessThan": "0898c6f9fa9ce2632ae88bd0f34a878ccc6335af",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "10239edf86f137ce4c39b62ea9575e8053c549a0",
                            "lessThan": "eb56a495f59baf6cad5ed80e3ffb9078098b1346",
                            "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_hhf.c"
                    ],
                    "versions": [
                        {
                            "version": "3.14",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "3.14",
                            "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": "3.14",
                                    "versionEndExcluding": "5.10.271"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "3.14",
                                    "versionEndExcluding": "5.15.222"
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                                    "versionStartIncluding": "3.14",
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                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "3.14",
                                    "versionEndExcluding": "7.3"
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            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/a328698d046098e6f55b3b1460cac6bab577be58"
                },
                {
                    "url": "https://git.kernel.org/stable/c/c364ad3ab3c8a6bce469a5cbf02881ab1324c5da"
                },
                {
                    "url": "https://git.kernel.org/stable/c/2c6dd9fc86d446a03728c43f3b96d9ae29aa058f"
                },
                {
                    "url": "https://git.kernel.org/stable/c/6570f326a6a96bedf3d1d1dab6acc9f8c29104ec"
                },
                {
                    "url": "https://git.kernel.org/stable/c/1113b674307ffddd402524bd1fd9d7d5629b705b"
                },
                {
                    "url": "https://git.kernel.org/stable/c/2e77947bbf6c166e76c038663832d0914418f761"
                },
                {
                    "url": "https://git.kernel.org/stable/c/0898c6f9fa9ce2632ae88bd0f34a878ccc6335af"
                },
                {
                    "url": "https://git.kernel.org/stable/c/eb56a495f59baf6cad5ed80e3ffb9078098b1346"
                }
            ],
            "title": "net/sched: hhf: clamp quantum in change and init paths",
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}