Linux kernel qdisc flaw allows local privilege escalation (CVE-2026-98797)
Original title: ZDI-26-1002: Linux Kernel Net Scheduler Qdisc Improper Validation of Array Index Local Privilege Escalation Vulnerability
ZDI rates CVE-2026-98797 at CVSS 8.8; exploitation requires existing low-privileged code execution.
ZDI published ZDI-26-1002, a local privilege escalation in the Linux kernel net scheduler qdisc code caused by improper validation of an array index. An attacker must already be able to run low-privileged code on the system. ZDI assigned CVE-2026-98797 and a CVSS rating of 8.8. No fixed version or exploitation status is stated.
- The bug is an improper array-index check in net scheduler qdisc code.
- ZDI advisory identifier is ZDI-26-1002.
- No affected or fixed kernel versions are stated.
Impact: local privilege escalation from low-privileged code
| Product | Affected |
|---|---|
| Linux Kernel | — |
- CVEs
- CVE-2026-98797
- Vendors
- Linux
- Products
- Linux Kernel
- Organizations
- Zero Day Initiative
Vulnerabilities mentioned
All| CVE | Vulnerability | CVSS | EPSS | Signals | Published |
|---|---|---|---|---|---|
| CVE-2026-98797 | Array index flaw in Linux kernel taprio TX queue mapping | — | — |
From the original article
This vulnerability allows local attackers to escalate privileges on affected installations of Linux Kernel. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability. The ZDI has assigned a CVSS rating of 8.
zerodayinitiative.com
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