{"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"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.14", "versionEndExcluding": "6.1.189"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.14", "versionEndExcluding": "6.6.158"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.14", "versionEndExcluding": "6.12.111"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.14", "versionEndExcluding": "6.18.53"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.14", "versionEndExcluding": "7.2.7"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.14", "versionEndExcluding": "7.3"}]}]}], "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", "x_generator": {"engine": "bippy-1.2.0"}}}}

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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["net/sched/sch_hhf.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "a328698d046098e6f55b3b1460cac6bab577be58", "status": "affected", "version": "10239edf86f137ce4c39b62ea9575e8053c549a0", "versionType": "git"}, {"lessThan": "c364ad3ab3c8a6bce469a5cbf02881ab1324c5da", "status": "affected", "version": "10239edf86f137ce4c39b62ea9575e8053c549a0", "versionType": "git"}, {"lessThan": "2c6dd9fc86d446a03728c43f3b96d9ae29aa058f", "status": "affected", "version": "10239edf86f137ce4c39b62ea9575e8053c549a0", "versionType": "git"}, {"lessThan": "6570f326a6a96bedf3d1d1dab6acc9f8c29104ec", "status": "affected", "version": "10239edf86f137ce4c39b62ea9575e8053c549a0", "versionType": "git"}, {"lessThan": "1113b674307ffddd402524bd1fd9d7d5629b705b", "status": "affected", "version": "10239edf86f137ce4c39b62ea9575e8053c549a0", "versionType": "git"}, {"lessThan": "2e77947bbf6c166e76c038663832d0914418f761", "status": "affected", "version": "10239edf86f137ce4c39b62ea9575e8053c549a0", "versionType": "git"}, {"lessThan": "0898c6f9fa9ce2632ae88bd0f34a878ccc6335af", "status": "affected", "version": "10239edf86f137ce4c39b62ea9575e8053c549a0", "versionType": "git"}, {"lessThan": "eb56a495f59baf6cad5ed80e3ffb9078098b1346", "status": "affected", "version": "10239edf86f137ce4c39b62ea9575e8053c549a0", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["net/sched/sch_hhf.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "3.14"}, {"lessThan": "3.14", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.10.*", "status": "unaffected", "version": "5.10.271", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.222", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.189", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.158", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.111", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.53", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.7", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "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"}], "id": "CVE-2026-98011", "lastModified": "2026-10-19T10:17:52.520", "metrics": {}, "published": "2026-09-25T11:17:29.427", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/0898c6f9fa9ce2632ae88bd0f34a878ccc6335af"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/1113b674307ffddd402524bd1fd9d7d5629b705b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/2c6dd9fc86d446a03728c43f3b96d9ae29aa058f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/2e77947bbf6c166e76c038663832d0914418f761"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/6570f326a6a96bedf3d1d1dab6acc9f8c29104ec"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/a328698d046098e6f55b3b1460cac6bab577be58"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/c364ad3ab3c8a6bce469a5cbf02881ab1324c5da"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/eb56a495f59baf6cad5ed80e3ffb9078098b1346"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: net/sched: hhf: clamp quantum in change and init paths", "id": "2541249", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2541249"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-606", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nnet/sched: hhf: clamp quantum in change and init paths\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).\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.\nConditions to recreate the bug:\nCONFIG_NET_SCH_HHF=y. Requires CAP_NET_ADMIN (namespace-local via\nunshare -Urn suffices).\ntc qdisc add dev dummy0 root hhf\ntc qdisc change dev dummy0 root hhf quantum 1 stab data 32768 size_log 15 cell_log 0", "A flaw was found in the Linux kernel's Heavy-Hitter Filter (HHF) network scheduler. A local attacker with network administration privileges, which can be acquired within an unprivileged user namespace, can cause a Denial of Service (DoS). By setting an excessively small quantum value alongside a crafted packet size table, an attacker forces the scheduler into an extensive processing loop while holding a lock, resulting in a system soft lockup."], "name": "CVE-2026-98011", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Fix deferred", "package_name": "openshift/ose-rhel-coreos-8", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Not affected", "package_name": "openshift/ose-rhel-coreos-9", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-09-25T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-98011\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-98011\nhttps://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98011.mbox"], "threat_severity": "Low"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[10239edf86f137ce4c39b62ea9575e8053c549a0,1113b674307ffddd402524bd1fd9d7d5629b705b)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[10239edf86f137ce4c39b62ea9575e8053c549a0,2e77947bbf6c166e76c038663832d0914418f761)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[10239edf86f137ce4c39b62ea9575e8053c549a0,0898c6f9fa9ce2632ae88bd0f34a878ccc6335af)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[10239edf86f137ce4c39b62ea9575e8053c549a0,eb56a495f59baf6cad5e80e3ffb9078098b1346)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "3.14"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,3.14)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.111,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.53,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2.7,7.3.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.3-rc3,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-09-25T15:30:06.905649+00:00", "updated": "2026-10-01T01:45:16.948587+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}