CVE-2026-98011

CVE CVE-2026-98011EUVD EUVD-2026-86664Published 2026-09-25T10:23:35.000Z

What the advisory describes

In the Linux kernel, the following vulnerability has been resolved: net/sched: hhf: clamp quantum in change and init paths hhf_change() accepts any quantum 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, ...) in hhf_change() matching fq_codel_change(). Clamp hhf_init() to [256, 1<<20] matching the siblings, and remove the old fallback that only set quantum=256 on overflow. Conditions to recreate the bug: CONFIG_NET_SCH_HHF=y. Requires CAP_NET_ADMIN (namespace-local via unshare -Urn suffices). tc qdisc add dev dummy0 root hhf tc qdisc change dev dummy0 root hhf 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 10239edf86f137ce4c39b62ea9575e8053c549a0 <0898c6f9fa9ce2632ae88bd0f34a878ccc6335af; patch: 7.3-rc3; 10239edf86f137ce4c39b62ea9575e8053c549a0 <1113b674307ffddd402524bd1fd9d7d5629b705b; patch: 7.2.7; 3.14; patch: 6.12.111; 10239edf86f137ce4c39b62ea9575e8053c549a0 <2e77947bbf6c166e76c038663832d0914418f761; patch: 0; 10239edf86f137ce4c39b62ea9575e8053c549a0 <eb56a495f59baf6cad5ed80e3ffb9078098b1346; patch: 6.18.53

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Carried in the product catalogue

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Linux — Linux

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