{"id":"CVE-2026-98013","title":"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 …","summary":"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 …","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= ec97ecf1ebe485a17cd8395a5f35e6b80b57665a < f90fe65b977e7aa9eb302230a09eb18f8c32ceaa","Linux >= ec97ecf1ebe485a17cd8395a5f35e6b80b57665a < c11e3a39807eb5a200445ae9082843ab86800415","Linux >= ec97ecf1ebe485a17cd8395a5f35e6b80b57665a < 6655b56e2801008566c594ef231f6c7b3f716c61","Linux >= ec97ecf1ebe485a17cd8395a5f35e6b80b57665a < 4864f58c53eb47257d55e01f47d4a9f355f7f970","Linux 5.6"],"published":"2026-09-25","updated":"2026-09-25","sourceUpdated":"2026-09-25T11:17:29.660","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-98013","references":[{"url":"https://git.kernel.org/stable/c/4864f58c53eb47257d55e01f47d4a9f355f7f970","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/6655b56e2801008566c594ef231f6c7b3f716c61","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/c11e3a39807eb5a200445ae9082843ab86800415","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/f90fe65b977e7aa9eb302230a09eb18f8c32ceaa","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd","cve.org"],"ingestedAt":"2026-09-25T11:06:38.858Z","slug":"CVE-2026-98013","body":"## Overview\n\nIn 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\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}