CVE-2026-98010: Linux kernel · net/sched: drr: clamp quantum in change class
Affects Linux kernelSource GCVE Database
Not known to be exploited.
Data as of 26 Oct 2026, 14:05 UTC
Rated by Threat Radar · CVSS not yet scored by NVD
- EPSS
- 0.1% chance of exploitation in 30 days – higher than 7% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Exploitation evidence
Disclosed: evidence found.
CVE published 25 Sep 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.
What to do
Affected software
| Product | Affected | Fixed in |
|---|---|---|
Ubuntu 26.04 LTSlinuxpkg:deb/ubuntu/linux?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-awspkg:deb/ubuntu/linux-aws?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-azurepkg:deb/ubuntu/linux-azure?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-azure-fdepkg:deb/ubuntu/linux-azure-fde?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-gcppkg:deb/ubuntu/linux-gcp?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-gkepkg:deb/ubuntu/linux-gke?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
AI-suggested
A fix has been implemented that clamps the quantum value to a safe range after rejecting zero and on the fallback path, preventing the indefinite spinning of the deficit-refill loop. Users should apply the official Linux kernel updates that include this fix. Since the vulnerability requires CAP_NET_ADMIN privileges, restricting administrative access also mitigates risk. Patch status is not explicitly confirmed in the provided data; users should consult the vendor or distribution advisories for the latest remediation guidance.
Description
A vulnerability in the Linux kernel's net/sched subsystem related to the Deficit Round Robin (DRR) queuing discipline was resolved. The issue involves improper handling of the quantum parameter in the drr_change_class() function, where an explicit quantum value of zero is rejected but a fallback to psched_mtu() occurs without a minimum floor. This can cause the deficit-refill loop to spin indefinitely under the qdisc lock when a crafted size table causes qdisc_pkt_len to reach approximately 2 GiB. The vulnerability requires the CONFIG_NET_SCH_DRR kernel configuration and CAP_NET_ADMIN privileges to exploit.
References
- ubuntu.com/security/CVE-2026-98010 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-98010 (opens in a new tab)
- git.kernel.org/stable/c/d43cded350fe1218493ad3d37a276aff14108ae6 (opens in a new tab)
- git.kernel.org/stable/c/8382abec0f1568d0a5590d75a3df92f23fcf5196 (opens in a new tab)
- git.kernel.org/stable/c/dc8b374214ef5bba4882bbd95b361e42555cfc0d (opens in a new tab)
- git.kernel.org/stable/c/8f756ae1c87414ce9cc21b30e6e4c036d6e9e80b (opens in a new tab)
- nvd.nist.gov/vuln/detail/CVE-2026-98010 (opens in a new tab)
- git.kernel.org/stable/c/23fea7e6736b2e1c6f6f2f05cccf33d36834da73 (opens in a new tab)
- git.kernel.org/stable/c/560794ee6e040b6e1c4ac2b3c8909f341a4596ee (opens in a new tab)
- git.kernel.org/stable/c/b464affe9f9dfe41ac48930c376e3fb8596651b0 (opens in a new tab)
- git.kernel.org/stable/c/e2297bbf9cf6ece86f1d1f8c683517a994990f9e (opens in a new tab)