CVE-2026-98010: net/sched: drr: clamp quantum in change class

Received
AliasesUBUNTU-CVE-2026-98010DEBIAN-CVE-2026-98010
Published 25-09-2026Last modified 19-10-2026

Vulnerability summary

CVE-2026-98010 is a vulnerability in linux with no CVSS score yet. EPSS estimates a 0.18% chance of exploitation in the next 30 days, higher than 7.2% of scored vulnerabilities.

Priority
Insufficient evidence

No CVSS vector published; no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
Not scored
010
No CVSS score recorded
EPSS score
0.18%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 13 · Related 11
MGASA-2026-0506MGASA-2026-0542OPENSUSE-SU-2026:12074-1OPENSUSE-SU-2026:22167-1SUSE-SU-2026:24371-1SUSE-SU-2026:24379-1

Timeline

  1. 25-09-2026
    PublishedVulnerability first disclosed.
  2. 19-10-2026
    Last modifiedVulnerability information updated.

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

CVSS metrics

Risk metrics not yet published.

EPSS trend

Probability

0.18%

Chance of exploitation in the next 30 days

Percentile

7%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.18% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Version check

Known conditions: not stated in public data.

Ubuntu169 products
  • linuxAll versions (No fix recorded)
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded)
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Debian2 products
  • linuxAll versions (No fix recorded) | < 6.1.190-1 | < 6.12.111-1 | < 7.2.7-1
  • linux-6.12< 6.12.111-1~deb12u1
Linux1 product
  • linux≥ 13d2a1d2b032de08d7dcab6a1edcd47802681f96, < e2297bbf9cf6ece86f1d1f8c683517a994990f9e | ≥ 13d2a1d2b032de08d7dcab6a1edcd47802681f96, < 560794ee6e040b6e1c4ac2b3c8909f341a4596ee | ≥ 13d2a1d2b032de08d7dcab6a1edcd47802681f96, < 23fea7e6736b2e1c6f6f2f05cccf33d36834da73 | ≥ 13d2a1d2b032de08d7dcab6a1edcd47802681f96, < b464affe9f9dfe41ac48930c376e3fb8596651b0 | ≥ 13d2a1d2b032de08d7dcab6a1edcd47802681f96, < dc8b374214ef5bba4882bbd95b361e42555cfc0d | ≥ 13d2a1d2b032de08d7dcab6a1edcd47802681f96, < d43cded350fe1218493ad3d37a276aff14108ae6 | ≥ 13d2a1d2b032de08d7dcab6a1edcd47802681f96, < 8f756ae1c87414ce9cc21b30e6e4c036d6e9e80b | ≥ 13d2a1d2b032de08d7dcab6a1edcd47802681f96, < 8382abec0f1568d0a5590d75a3df92f23fcf5196 | 2.6.29

3 vendors · 172 products

References

11 links
Show all 11 references