Description (CNA)
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 (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33 before 440b66cc7b56ea38e9b878ae88da91992efaa4c4; affected dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33 before 4ef8664eafafc8db68a1d52601f17dc008a223b7; affected dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33 before 8b8d782c3b96376217087767dcf662cd3d25f226; affected dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33 before 226d2702e74a570f5bfae6115b4706da4b94e5cf; affected dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33 before 99ae477b892e203a37985ebc56f0063e072f7f4b; affected dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33 before 8f80b113dea0bed3c1a31a4224b72775cd9ec52d; affected dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33 before de22c30ec5598aca8797f02082d2ee1358dfa3ff; affected dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33 before 1c38487f46b243bfeefec0c0c86023a3904f2214 |
| Linux / Linux | affected 5.6; unaffected 0 before 5.6; unaffected 5.10.271 through 5.10.*; unaffected 5.15.222 through 5.15.*; unaffected 6.1.189 through 6.1.*; unaffected 6.6.158 through 6.6.*; unaffected 6.12.111 through 6.12.*; unaffected 6.18.53 through 6.18.*; unaffected 7.2.7 through 7.2.*; unaffected 7.3 through * |
CWE
No CWE identifiers supplied.
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