net/sched: drr: clamp quantum in change class (Linux Linux)
At a glance
- Source
- NVD
- EPSS
- EPSS 0.18 % · percentile 7 ()
- State
- PUBLISHED
- Published
- Updated
- Assigner
- Linux
- NVD status
- Received
Description
In the Linux kernel, the following vulnerability has been resolved: net/sched: drr: clamp quantum in change class drr_change_class() rejects explicit quantum==0 but falls back to psched_mtu() with no floor. With a crafted size table qdisc_pkt_len reaches ~2 GiB, so quantum=1 (or a zero psched_mtu on a headerless device) makes the deficit-refill loop spin under the qdisc lock. Add clamp_t(u32, quantum, 256, 1<<20) after the zero reject and on the fallback path. The explicit-zero reject is preserved. Conditions to recreate the bug: CONFIG_NET_SCH_DRR=y. Requires CAP_NET_ADMIN (namespace-local via unshare -Urn suffices). tc qdisc add dev dummy0 root drr tc class add dev dummy0 parent 1: classid 1:1 drr quantum 1
References
- https://git.kernel.org/stable/c/e2297bbf9cf6ece86f1d1f8c683517a994990f9e
- https://git.kernel.org/stable/c/560794ee6e040b6e1c4ac2b3c8909f341a4596ee
- https://git.kernel.org/stable/c/23fea7e6736b2e1c6f6f2f05cccf33d36834da73
- https://git.kernel.org/stable/c/b464affe9f9dfe41ac48930c376e3fb8596651b0
- https://git.kernel.org/stable/c/dc8b374214ef5bba4882bbd95b361e42555cfc0d
- https://git.kernel.org/stable/c/d43cded350fe1218493ad3d37a276aff14108ae6
- https://git.kernel.org/stable/c/8f756ae1c87414ce9cc21b30e6e4c036d6e9e80b
- https://git.kernel.org/stable/c/8382abec0f1568d0a5590d75a3df92f23fcf5196
European references
- ENISA EUVD · EUVD-2026-86663
- GCVE · GCVE-0-2026-98010
CERT-FR advisories
- CERTFR-2026-AVI-1432 — Multiples vulnérabilités dans le noyau Linux de SUSE · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1385 — Multiples vulnérabilités dans les produits VMware · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1375 — Multiples vulnérabilités dans le noyau Linux de Debian LTS · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1289 — Multiples vulnérabilités dans le noyau Linux de Debian LTS · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1253 — Multiples vulnérabilités dans le noyau Linux de Debian · cert.ssi.gouv.fr
Affected products
| Product | Versions |
|---|---|
| Linux · Linux | affected 13d2a1d2b032de08d7dcab6a1edcd47802681f96 < e2297bbf9cf6ece86f1d1f8c683517a994990f9e ; affected 13d2a1d2b032de08d7dcab6a1edcd47802681f96 < 560794ee6e040b6e1c4ac2b3c8909f341a4596ee ; affected 13d2a1d2b032de08d7dcab6a1edcd47802681f96 < 23fea7e6736b2e1c6f6f2f05cccf33d36834da73 ; affected 13d2a1d2b032de08d7dcab6a1edcd47802681f96 < b464affe9f9dfe41ac48930c376e3fb8596651b0 ; affected 13d2a1d2b032de08d7dcab6a1edcd47802681f96 < dc8b374214ef5bba4882bbd95b361e42555cfc0d ; affected 13d2a1d2b032de08d7dcab6a1edcd47802681f96 < d43cded350fe1218493ad3d37a276aff14108ae6 |
| Linux · Linux | affected 2.6.29 ; unaffected 0 < 2.6.29 ; unaffected 5.10.271 ≤ 5.10.* ; unaffected 5.15.222 ≤ 5.15.* ; unaffected 6.1.189 ≤ 6.1.* ; unaffected 6.6.158 ≤ 6.6.* |
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| CERT-FR (ANSSI) | Licence Ouverte / Etalab 2.0 |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |