CVE-2026-98009

CVE CVE-2026-98009EUVD EUVD-2026-86662Published 2026-09-25T10:23:34.000Z

What the advisory describes

In the Linux kernel, the following vulnerability has been resolved: net/sched: ets: clamp quantum in parse and fallback paths ets_qdisc_change() falls back to psched_mtu() with no floor for bands without an explicit quantum. With a crafted size table qdisc_pkt_len reaches ~2 GiB, so a zero psched_mtu on a headerless device makes the deficit-refill loop spin under the qdisc lock. Move the floor into ets_quantum_parse() so explicitly configured quanta are also clamped to [256, 1<<20], not just the fallback path. Conditions to recreate the bug: CONFIG_NET_SCH_ETS=y. Requires CAP_NET_ADMIN (namespace-local via unshare -Urn suffices). tc qdisc add dev dummy0 root ets bands 3 strict 2 quanta 1 1

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: 6.18.53; patch: 0; patch: 7.2.7; 5.6; dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33 <1c38487f46b243bfeefec0c0c86023a3904f2214; dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33 <8f80b113dea0bed3c1a31a4224b72775cd9ec52d; patch: 6.12.111; dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33 <de22c30ec5598aca8797f02082d2ee1358dfa3ff; patch: 7.3-rc3; dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33 <99ae477b892e203a37985ebc56f0063e072f7f4b

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Carried in the product catalogue

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Linux — Linux

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