CVE-2026-74341
Description
A flaw was found in the wcn36xx Wi-Fi driver in the Linux kernel. The firmware response dispatcher in this driver fails to validate the length of synchronous Hardware Abstraction Layer (HAL) responses. This allows an attacker to craft an oversized firmware response, leading to a heap buffer overflow. The overflow can result in the execution of arbitrary code or a denial of service.
Statement
This vulnerability is rated as Moderate impact because exploitation requires compromised wireless firmware or direct access to specific Qualcomm hardware to trigger the buffer overflow. In default Red Hat Enterprise Linux environments, the wcn36xx driver is not enabled or shipped, rendering enterprise installations unaffected in standard configurations. Systems lacking this specific mobile Wi-Fi hardware or kernel driver configuration are not exposed to this flaw.
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 | 8.8 |
| Attack Vector | Local | N/A | Adjacent Network |
| Attack Complexity | Low | N/A | Low |
| Privileges Required | Low | N/A | None |
| 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:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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