CVE-2026-43400
Description
A flaw was found in the Linux kernel's drm/amdgpu module. A local user could exploit this vulnerability by providing excessively large input values to the amdgpu_userq_signal_ioctl function. This lack of proper input validation can lead to an Out-Of-Memory (OOM) condition, causing a Denial of Service (DoS) on the affected system.
Statement
This vulnerability is rated as Moderate impact for Red Hat Enterprise Linux because exploitation requires local access with privileges to interact with the AMD GPU device node, limiting the blast radius to a system denial of service. Systems are only exposed if AMD graphics hardware is present and the amdgpu kernel module is loaded. Environments without AMD GPU hardware or where direct access to Direct Rendering Manager (DRM) interfaces is restricted are not susceptible to this flaw.
Mitigation
Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
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 | 5.5 | N/A |
| Attack Vector | Local | Local | N/A |
| Attack Complexity | Low | Low | N/A |
| Privileges Required | Low | Low | N/A |
| User Interaction | None | None | N/A |
| Scope | Unchanged | Unchanged | N/A |
| Confidentiality | None | None | N/A |
| Integrity Impact | None | None | N/A |
| Availability Impact | High | High | N/A |
Vector
Red Hat: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
NVD: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
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