CVE-2026-68236
Description
A flaw was found in the Linux kernel's drm/amd/display component. Specifically, within the dm_update_crtc_state() function, a stream pointer is released but not subsequently set to NULL. This can lead to a double release of the same pointer if an error occurs later in the process, creating a use-after-free vulnerability. This issue could potentially lead to memory corruption or a denial of service.
Mitigation
To mitigate this issue on systems that do not require AMD graphics hardware, prevent the amdgpu module from loading:
1. Create a configuration file in /etc/modprobe.d to disable the driver:
# echo "install amdgpu /bin/true" > /etc/modprobe.d/disable-amdgpu.conf
2. If the amdgpu module is already loaded in the running kernel, a system reboot is required for the configuration to take effect.
Warning: Disabling this module prevents the initialization of AMD graphics adapters, which disables graphical desktop environments, display output, and GPU acceleration on systems relying on AMD hardware.
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).
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 7 | N/A | 7.8 |
| Attack Vector | Local | N/A | Local |
| Attack Complexity | High | N/A | Low |
| Privileges Required | Low | N/A | Low |
| User Interaction | None | N/A | None |
| Scope | Unchanged | N/A | Unchanged |
| Confidentiality | High | N/A | High |
| Integrity Impact | High | N/A | High |
| Availability Impact | High | N/A | High |
Vector
Red Hat: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
cve.org: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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