UNKNOWN NVD
CVE-2026-98009
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
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
References
- https://git.kernel.org/stable/c/1c38487f46b243bfeefec0c0c86023a3904f2214
- https://git.kernel.org/stable/c/8f80b113dea0bed3c1a31a4224b72775cd9ec52d
- https://git.kernel.org/stable/c/99ae477b892e203a37985ebc56f0063e072f7f4b
- https://git.kernel.org/stable/c/de22c30ec5598aca8797f02082d2ee1358dfa3ff
This unknown severity vulnerability was published on 2026-09-25 via NVD.
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