CVE-2026-98009
Description
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
How to fix
- Linux Linux440b66cc7b56ea38e9b878ae88da91992efaa4c4, 4ef8664eafafc8db68a1d52601f17dc008a223b7, 8b8d782c3b96376217087767dcf662cd3d25f226, 226d2702e74a570f5bfae6115b4706da4b94e5cf, 99ae477b892e203a37985ebc56f0063e072f7f4b, 8f80b113dea0bed3c1a31a4224b72775cd9ec52d, de22c30ec5598aca8797f02082d2ee1358dfa3ff, 1c38487f46b243bfeefec0c0c86023a3904f2214 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33 ≤ v < 440b66cc7b56ea38e9b878ae88da91992efaa4c4, dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33 ≤ v < 4ef8664eafafc8db68a1d52601f17dc008a223b7, dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33 ≤ v < 8b8d782c3b96376217087767dcf662cd3d25f226, dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33 ≤ v < 226d2702e74a570f5bfae6115b4706da4b94e5cf, dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33 ≤ v < 99ae477b892e203a37985ebc56f0063e072f7f4b, dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33 ≤ v < 8f80b113dea0bed3c1a31a4224b72775cd9ec52d, dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33 ≤ v < de22c30ec5598aca8797f02082d2ee1358dfa3ff, dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33 ≤ v < 1c38487f46b243bfeefec0c0c86023a3904f2214, 5.6 | 440b66cc7b56ea38e9b878ae88da91992efaa4c4, 4ef8664eafafc8db68a1d52601f17dc008a223b7, 8b8d782c3b96376217087767dcf662cd3d25f226, 226d2702e74a570f5bfae6115b4706da4b94e5cf, 99ae477b892e203a37985ebc56f0063e072f7f4b, 8f80b113dea0bed3c1a31a4224b72775cd9ec52d, de22c30ec5598aca8797f02082d2ee1358dfa3ff, 1c38487f46b243bfeefec0c0c86023a3904f2214 |
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