{"id":"CVE-2026-98013","revision":"55969b2adf164b739c6489633167e2ee","records":[{"revision":"55969b2adf164b739c6489633167e2ee","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-98013","aliases":[],"title":"net/sched: fq_pie: clamp quantum in change path","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: fq_pie: clamp quantum in change path\n\nfq_pie_change() accepts any quantum value from userspace, including 1.\nWith a crafted size table qdisc_pkt_len reaches ~2 GiB, so quantum=1\nmakes the deficit-refill loop spin ~2^31 times under the qdisc lock\n(a soft lockup / denial of service).\n\nAdd max(256U, ...) matching fq_codel_change().\n\nConditions to recreate the bug:\n  CONFIG_NET_SCH_FQ_PIE=y. Requires CAP_NET_ADMIN (namespace-local via\n  unshare -Urn suffices).\n\n  tc qdisc add dev dummy0 root fq_pie\n  tc qdisc change dev dummy0 root fq_pie quantum 1 stab data 32768 size_log 15 cell_log 0","state":0,"publishedAt":"2026-09-25T10:23:36.527+00:00","modifiedAt":"2026-10-19T09:12:18.653+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"net/sched/sch_fq_pie.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"ec97ecf1ebe485a17cd8395a5f35e6b80b57665a\",\n                            \"lessThan\": \"ff4f3a0f3abd2ded467931d7da7984a68a768e0b\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"ec97ecf1ebe485a17cd8395a5f35e6b80b57665a\",\n                            \"lessThan\": \"749aaebc1eb92ce2f38fd3caf68a2f99686d84ef\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"ec97ecf1ebe485a17cd8395a5f35e6b80b57665a\",\n                            \"lessThan\": \"8fd98e56c41f79278eeb67512c28d7abc175bcf4\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"ec97ecf1ebe485a17cd8395a5f35e6b80b57665a\",\n                            \"lessThan\": \"215df1e953ae72a09d425ec188e054058ae23dc9\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"ec97ecf1ebe485a17cd8395a5f35e6b80b57665a\",\n                            \"lessThan\": \"f90fe65b977e7aa9eb302230a09eb18f8c32ceaa\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"ec97ecf1ebe485a17cd8395a5f35e6b80b57665a\",\n                            \"lessThan\": \"c11e3a39807eb5a200445ae9082843ab86800415\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"ec97ecf1ebe485a17cd8395a5f35e6b80b57665a\",\n                            \"lessThan\": \"6655b56e2801008566c594ef231f6c7b3f716c61\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"ec97ecf1ebe485a17cd8395a5f35e6b80b57665a\",\n                            \"lessThan\": \"4864f58c53eb47257d55e01f47d4a9f355f7f970\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"net/sched/sch_fq_pie.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"5.6\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"5.6\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.271\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.222\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.189\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.158\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.111\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.53\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.7\",\n                            \"lessThanOrEqual\": \"7.2.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.3\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[],"references":["https://git.kernel.org/stable/c/ff4f3a0f3abd2ded467931d7da7984a68a768e0b","https://git.kernel.org/stable/c/749aaebc1eb92ce2f38fd3caf68a2f99686d84ef","https://git.kernel.org/stable/c/8fd98e56c41f79278eeb67512c28d7abc175bcf4","https://git.kernel.org/stable/c/215df1e953ae72a09d425ec188e054058ae23dc9","https://git.kernel.org/stable/c/f90fe65b977e7aa9eb302230a09eb18f8c32ceaa","https://git.kernel.org/stable/c/c11e3a39807eb5a200445ae9082843ab86800415","https://git.kernel.org/stable/c/6655b56e2801008566c594ef231f6c7b3f716c61","https://git.kernel.org/stable/c/4864f58c53eb47257d55e01f47d4a9f355f7f970"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-98013","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-98013","identifiers":["CVE-2026-98013"]},"retained":false,"historicalAffected":[]}],"coverage":[]}