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
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33 to < 440b66cc7b56ea38e9b878ae88da91992efaa4c4affecteddcc68b4d8084e1ac9af0d4022d6b1aff6a139a33 to < 4ef8664eafafc8db68a1d52601f17dc008a223b7affecteddcc68b4d8084e1ac9af0d4022d6b1aff6a139a33 to < 8b8d782c3b96376217087767dcf662cd3d25f226affecteddcc68b4d8084e1ac9af0d4022d6b1aff6a139a33 to < 226d2702e74a570f5bfae6115b4706da4b94e5cfaffecteddcc68b4d8084e1ac9af0d4022d6b1aff6a139a33 to < 99ae477b892e203a37985ebc56f0063e072f7f4baffecteddcc68b4d8084e1ac9af0d4022d6b1aff6a139a33 to < 8f80b113dea0bed3c1a31a4224b72775cd9ec52daffecteddcc68b4d8084e1ac9af0d4022d6b1aff6a139a33 to < de22c30ec5598aca8797f02082d2ee1358dfa3ffaffecteddcc68b4d8084e1ac9af0d4022d6b1aff6a139a33 to < 1c38487f46b243bfeefec0c0c86023a3904f2214affected
Linux Linux
Default version status: affected
5.6affected0 to < 5.6unaffected5.10.271 to ≤ 5.10.*unaffected5.15.222 to ≤ 5.15.*unaffected6.1.189 to ≤ 6.1.*unaffected6.6.158 to ≤ 6.6.*unaffected6.12.111 to ≤ 6.12.*unaffected6.18.53 to ≤ 6.18.*unaffected7.2.7 to ≤ 7.2.*unaffected7.3 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/440b66cc7b56ea38e9b878ae88da91992efaa4c4 ↗
- https://git.kernel.org/stable/c/4ef8664eafafc8db68a1d52601f17dc008a223b7 ↗
- https://git.kernel.org/stable/c/8b8d782c3b96376217087767dcf662cd3d25f226 ↗
- https://git.kernel.org/stable/c/226d2702e74a570f5bfae6115b4706da4b94e5cf ↗
- https://git.kernel.org/stable/c/99ae477b892e203a37985ebc56f0063e072f7f4b ↗
- https://git.kernel.org/stable/c/8f80b113dea0bed3c1a31a4224b72775cd9ec52d ↗
- https://git.kernel.org/stable/c/de22c30ec5598aca8797f02082d2ee1358dfa3ff ↗
- https://git.kernel.org/stable/c/1c38487f46b243bfeefec0c0c86023a3904f2214 ↗