CVE-2026-98012

{"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": [{"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"}, {"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", "versionType": "git"}, {"version": "e4650d7ae4252f67e997a632adfae0dd74d3a99a", "lessThan": "534cd7ecbbc6e8a974f4003a5c1557439c6e0a72", "status": "affected", "versionType": "git"}, {"version": "e4650d7ae4252f67e997a632adfae0dd74d3a99a", "lessThan": "e6c1cb728e389354203a72bc77464c222a247aeb", "status": "affected", "versionType": "git"}, {"version": "e4650d7ae4252f67e997a632adfae0dd74d3a99a", "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"}, {"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": "5.10.239", "versionEndExcluding": "5.10.271"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15.186", "versionEndExcluding": "5.15.222"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1.129", "versionEndExcluding": "6.1.189"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6.76", "versionEndExcluding": "6.6.158"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12.13", "versionEndExcluding": "6.12.111"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.13", "versionEndExcluding": "6.18.53"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.13", "versionEndExcluding": "7.2.7"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.13", "versionEndExcluding": "7.3"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.4.297"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/4117c528b2de5fdc3e4a7e3626815b616a635cdc"}, {"url": "https://git.kernel.org/stable/c/f82fa6f10d4a69322cad0f7a4aa523ce6292a5a0"}, {"url": "https://git.kernel.org/stable/c/0692ce5a528df450d64e9f819054177e9d91076f"}, {"url": "https://git.kernel.org/stable/c/e4192bcf83aaab02129644ddf4656fd86e93751f"}, {"url": "https://git.kernel.org/stable/c/f3820dce042a673fcb28cc31c87ee14257e21a17"}, {"url": "https://git.kernel.org/stable/c/534cd7ecbbc6e8a974f4003a5c1557439c6e0a72"}, {"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", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["net/sched/sch_sfq.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "4117c528b2de5fdc3e4a7e3626815b616a635cdc", "status": "affected", "version": "4919649699c5f4dbae08b8e2ed536fc9d6c3c2aa", "versionType": "git"}, {"lessThan": "f82fa6f10d4a69322cad0f7a4aa523ce6292a5a0", "status": "affected", "version": "548cf048b426729a7a1fa6acd1271c010c9a7380", "versionType": "git"}, {"lessThan": "0692ce5a528df450d64e9f819054177e9d91076f", "status": "affected", "version": "c49ac48fac51a6a54efd5963954d02bacf075085", "versionType": "git"}, {"lessThan": "e4192bcf83aaab02129644ddf4656fd86e93751f", "status": "affected", "version": "58ae7465f0e7113d45aa88a66bf2d203c71c195e", "versionType": "git"}, {"lessThan": "f3820dce042a673fcb28cc31c87ee14257e21a17", "status": "affected", "version": "82bd38bd5467ece1ee274b493f51326cf5220a5a", "versionType": "git"}, {"lessThan": "534cd7ecbbc6e8a974f4003a5c1557439c6e0a72", "status": "affected", "version": "e4650d7ae4252f67e997a632adfae0dd74d3a99a", "versionType": "git"}, {"lessThan": "e6c1cb728e389354203a72bc77464c222a247aeb", "status": "affected", "version": "e4650d7ae4252f67e997a632adfae0dd74d3a99a", "versionType": "git"}, {"lessThan": "fb9f88a33c516ea5c0bcd9a22ca288b246b34567", "status": "affected", "version": "e4650d7ae4252f67e997a632adfae0dd74d3a99a", "versionType": "git"}, {"status": "affected", "version": "843cacb88f42f426973f1ed11c6fb562558efb27", "versionType": "git"}, {"lessThan": "5.10.271", "status": "affected", "version": "5.10.239", "versionType": "semver"}, {"lessThan": "5.15.222", "status": "affected", "version": "5.15.186", "versionType": "semver"}, {"lessThan": "6.1.189", "status": "affected", "version": "6.1.129", "versionType": "semver"}, {"lessThan": "6.6.158", "status": "affected", "version": "6.6.76", "versionType": "semver"}, {"lessThan": "6.12.111", "status": "affected", "version": "6.12.13", "versionType": "semver"}, {"lessThan": "5.5", "status": "affected", "version": "5.4.297", "versionType": "semver"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["net/sched/sch_sfq.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.13"}, {"lessThan": "6.13", "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: 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"}], "id": "CVE-2026-98012", "lastModified": "2026-10-19T10:17:54.200", "metrics": {}, "published": "2026-09-25T11:17:29.537", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/0692ce5a528df450d64e9f819054177e9d91076f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/4117c528b2de5fdc3e4a7e3626815b616a635cdc"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/534cd7ecbbc6e8a974f4003a5c1557439c6e0a72"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/e4192bcf83aaab02129644ddf4656fd86e93751f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/e6c1cb728e389354203a72bc77464c222a247aeb"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/f3820dce042a673fcb28cc31c87ee14257e21a17"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/f82fa6f10d4a69322cad0f7a4aa523ce6292a5a0"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/fb9f88a33c516ea5c0bcd9a22ca288b246b34567"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: net/sched: sfq: clamp quantum in change path", "id": "2541248", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2541248"}, "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: sfq: clamp quantum in change path\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).\nAdd max(256U, ...) matching fq_codel_change(). Reject quantum > 1<<20\nwith -EINVAL, matching fq_codel_change() and the init clamp.\nConditions to recreate the bug:\nCONFIG_NET_SCH_SFQ=y. Requires CAP_NET_ADMIN (namespace-local via\nunshare -Urn suffices).\ntc qdisc add dev dummy0 root sfq\ntc qdisc change dev dummy0 root sfq quantum 1 stab data 32768 size_log 15 cell_log 0", "A flaw was found in the Linux kernel's Stochastic Fairness Queueing (SFQ) network packet scheduling subsystem. A local attacker with network administration privileges, including within an unprivileged user namespace, can supply an improperly bounded quantum parameter alongside a crafted packet size table. This can trigger an excessively long execution loop while holding an internal lock, leading to a system lockup and a Denial of Service (DoS)."], "name": "CVE-2026-98012", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "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": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "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": "Not affected", "package_name": "openshift/ose-rhel-coreos-8", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Fix deferred", "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-2026-98012\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-98012\nhttps://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98012.mbox"], "threat_severity": "Low"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[82bd38bd5467ece1ee274b493f51326cf5220a5a,f3820dce042a673fcb28cc31c87ee14257e21a17)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[e4650d7ae4252f67e997a632adfae0dd74d3a99a,534cd7ecbbc6e8a974f4003a5c1557439c6e0a72)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[e4650d7ae4252f67e997a632adfae0dd74d3a99a,e6c1cb728e389354203a72bc77464c222a247aeb)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[e4650d7ae4252f67e997a632adfae0dd74d3a99a,fb9f88a33c516ea5c0bcd9a22ca288b246b34567)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "843cacb88f42f426973f1ed11c6fb562558efb27"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "4919649699c5f4dbae08b8e2ed536fc9d6c3c2aa"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "548cf048b426729a7a1fa6acd1271c010c9a7380"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "c49ac48fac51a6a54efd5963954d02bacf075085"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "58ae7465f0e7113d45aa88a66bf2d203c71c195e"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.12.13,6.12.111)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[5.4.297,5.5)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[5.10.239,5.11)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[5.15.186,5.16)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.1.129,6.2)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.6.76,6.7)"}}], "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": "6.13"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,6.13)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.12.111,6.12.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.18.53,6.18.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2.7,7.2.*]"}}, {"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": "2026-09-25T15:30:06.905490+00:00", "updated": "2026-09-30T15:30:14.870307+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}