CVE-2026-99192
Description
A flaw was found in the Linux kernel's Broadcom GENET (bcmgenet) ethernet driver, which can lead to a Denial of Service (DoS). When handling shared network packet buffers, the driver overwrites control block metadata while earlier packets are still pending in the transmission ring. This issue causes Byte Queue Limits (BQL) accounting to stall the network transmit queue until a watchdog timer resets the interface.
Statement
This vulnerability is rated as Moderate impact because it requires local access to trigger and exclusively impacts systems utilizing Broadcom GENET network controllers. In standard Red Hat enterprise environments, this specialized driver is not utilized on mainstream server architectures and is constrained to specific ARM platforms. An attacker can only cause a local denial of service through stalled transmission queues on the affected network interface, without compromising data confidentiality or system integrity.
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 | 4.7 | N/A | N/A |
| Attack Vector | Local | N/A | N/A |
| Attack Complexity | High | N/A | N/A |
| Privileges Required | Low | N/A | N/A |
| User Interaction | None | N/A | N/A |
| Scope | Unchanged | N/A | N/A |
| Confidentiality | None | N/A | N/A |
| Integrity Impact | None | N/A | N/A |
| Availability Impact | High | N/A | N/A |
Vector
Red Hat: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
Understanding the Weakness (CWE)
Integrity,Confidentiality,Other
Technical Impact: Modify Application Data; Read Application Data; Alter Execution Logic
If access to a shared resource is not synchronized, then the resource may not be in a state that is expected by the product. This might lead to unexpected or insecure behaviors, especially if an attacker can influence the shared resource.
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