CVE-2026-98013

CVE CVE-2026-98013EUVD EUVD-2026-86666Published 2026-09-25T10:23:36.000Z

What the advisory describes

In the Linux kernel, the following vulnerability has been resolved: net/sched: fq_pie: clamp quantum in change path fq_pie_change() accepts any quantum value from userspace, including 1. With a crafted size table qdisc_pkt_len reaches ~2 GiB, so quantum=1 makes the deficit-refill loop spin ~2^31 times under the qdisc lock (a soft lockup / denial of service). Add max(256U, ...) matching fq_codel_change(). Conditions to recreate the bug: CONFIG_NET_SCH_FQ_PIE=y. Requires CAP_NET_ADMIN (namespace-local via unshare -Urn suffices). tc qdisc add dev dummy0 root fq_pie tc qdisc change dev dummy0 root fq_pie quantum 1 stab data 32768 size_log 15 cell_log 0

Source: EUVD (ENISA), in the words of the advisory.

Products the advisory names

These come from the advisory itself, not from any check we performed.

Linux — Linux patch: 0; ec97ecf1ebe485a17cd8395a5f35e6b80b57665a <f90fe65b977e7aa9eb302230a09eb18f8c32ceaa; patch: 7.2.7; 5.6; ec97ecf1ebe485a17cd8395a5f35e6b80b57665a <4864f58c53eb47257d55e01f47d4a9f355f7f970; ec97ecf1ebe485a17cd8395a5f35e6b80b57665a <c11e3a39807eb5a200445ae9082843ab86800415; ec97ecf1ebe485a17cd8395a5f35e6b80b57665a <6655b56e2801008566c594ef231f6c7b3f716c61; patch: 6.12.111; patch: 7.3-rc3; patch: 6.18.53

The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.

Carried in the product catalogue

An estate covering these products can be recorded in Patchlage. An advisory about them appears in the next morning's situation report.

Linux — Linux

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