{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-98012",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2026-09-25T10:19:56.069Z",
        "datePublished": "2026-09-25T10:23:35.934Z",
        "dateUpdated": "2026-10-19T09:12:17.681Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-10-19T09:12:17.681Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: sfq: clamp quantum in change path\n\nsfq_change() accepts any non-negative quantum (only rejects\n(int)ctl->quantum < 0). With a crafted size table qdisc_pkt_len reaches\n~2 GiB, so quantum=1 makes the deficit-refill loop spin ~2^31 times\nunder the qdisc lock (a soft lockup / denial of service).\n\nAdd max(256U, ...) matching fq_codel_change(). Reject quantum > 1<<20\nwith -EINVAL, matching fq_codel_change() and the init clamp.\n\nConditions to recreate the bug:\n  CONFIG_NET_SCH_SFQ=y. Requires CAP_NET_ADMIN (namespace-local via\n  unshare -Urn suffices).\n\n  tc qdisc add dev dummy0 root sfq\n  tc qdisc change dev dummy0 root sfq quantum 1 stab data 32768 size_log 15 cell_log 0"
                }
            ],
            "affected": [
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                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "net/sched/sch_sfq.c"
                    ],
                    "versions": [
                        {
                            "version": "4919649699c5f4dbae08b8e2ed536fc9d6c3c2aa",
                            "lessThan": "4117c528b2de5fdc3e4a7e3626815b616a635cdc",
                            "status": "affected",
                            "versionType": "git"
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                            "version": "548cf048b426729a7a1fa6acd1271c010c9a7380",
                            "lessThan": "f82fa6f10d4a69322cad0f7a4aa523ce6292a5a0",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "c49ac48fac51a6a54efd5963954d02bacf075085",
                            "lessThan": "0692ce5a528df450d64e9f819054177e9d91076f",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "58ae7465f0e7113d45aa88a66bf2d203c71c195e",
                            "lessThan": "e4192bcf83aaab02129644ddf4656fd86e93751f",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "82bd38bd5467ece1ee274b493f51326cf5220a5a",
                            "lessThan": "f3820dce042a673fcb28cc31c87ee14257e21a17",
                            "status": "affected",
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                            "lessThan": "534cd7ecbbc6e8a974f4003a5c1557439c6e0a72",
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                            "versionType": "git"
                        },
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                            "lessThan": "e6c1cb728e389354203a72bc77464c222a247aeb",
                            "status": "affected",
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                            "lessThan": "fb9f88a33c516ea5c0bcd9a22ca288b246b34567",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "843cacb88f42f426973f1ed11c6fb562558efb27",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "5.10.239",
                            "lessThan": "5.10.271",
                            "status": "affected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.15.186",
                            "lessThan": "5.15.222",
                            "status": "affected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.1.129",
                            "lessThan": "6.1.189",
                            "status": "affected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.6.76",
                            "lessThan": "6.6.158",
                            "status": "affected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.12.13",
                            "lessThan": "6.12.111",
                            "status": "affected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.4.297",
                            "lessThan": "5.5",
                            "status": "affected",
                            "versionType": "semver"
                        }
                    ]
                },
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "net/sched/sch_sfq.c"
                    ],
                    "versions": [
                        {
                            "version": "6.13",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "6.13",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.10.271",
                            "lessThanOrEqual": "5.10.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
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                            "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": [
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                    "nodes": [
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                            "operator": "OR",
                            "negate": false,
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            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/4117c528b2de5fdc3e4a7e3626815b616a635cdc"
                },
                {
                    "url": "https://git.kernel.org/stable/c/f82fa6f10d4a69322cad0f7a4aa523ce6292a5a0"
                },
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                    "url": "https://git.kernel.org/stable/c/0692ce5a528df450d64e9f819054177e9d91076f"
                },
                {
                    "url": "https://git.kernel.org/stable/c/e4192bcf83aaab02129644ddf4656fd86e93751f"
                },
                {
                    "url": "https://git.kernel.org/stable/c/f3820dce042a673fcb28cc31c87ee14257e21a17"
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                    "url": "https://git.kernel.org/stable/c/534cd7ecbbc6e8a974f4003a5c1557439c6e0a72"
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                    "url": "https://git.kernel.org/stable/c/e6c1cb728e389354203a72bc77464c222a247aeb"
                },
                {
                    "url": "https://git.kernel.org/stable/c/fb9f88a33c516ea5c0bcd9a22ca288b246b34567"
                }
            ],
            "title": "net/sched: sfq: clamp quantum in change path",
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}