CVE-2026-23449
Description
A flaw was found in the Linux kernel's Traffic Equalizer (TEQL) network scheduler. When a TEQL device uses a lockless Queueing Discipline (Qdisc) as its root, a race condition can occur during the qdisc_reset operation if it is not properly synchronized with the datapath. This can lead to a double-free vulnerability, which may cause the system to crash, resulting in a Denial of Service (DoS).
Statement
This vulnerability affects systems using the TEQL (Traffic Equalizer) network scheduler with lockless qdiscs. TEQL is a specialized scheduler for load balancing across multiple network interfaces, not commonly used in typical deployments. The race condition requires specific timing and configuration to trigger.
Mitigation
To mitigate this issue, prevent the sch_teql module from being loaded. See https://access.redhat.com/solutions/41278 for instructions.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 5.5 | N/A | 7.8 |
| Attack Vector | Local | N/A | Local |
| Attack Complexity | Low | N/A | Low |
| Privileges Required | Low | N/A | Low |
| User Interaction | None | N/A | None |
| Scope | Unchanged | N/A | Unchanged |
| Confidentiality | None | N/A | High |
| Integrity Impact | None | N/A | High |
| Availability Impact | High | N/A | High |
Vector
Red Hat: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
cve.org: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Frequently Asked Questions
Not sure what something means? Check out our Security Glossary.
Want to get errata notifications? Sign up here.
