CVE-2026-46245

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

drm/amd/display: Fix dc_link NULL handling in HPD init

amdgpu_dm_hpd_init() may see connectors without a valid dc_link.

The code already checks dc_link for the polling decision, but later

unconditionally dereferences it when setting up HPD interrupts.

Assign dc_link early and skip connectors where it is NULL.

Fixes the below:

drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm_irq.c:940 amdgpu_dm_hpd_init()

error: we previously assumed 'dc_link' could be null (see line 931)

drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm_irq.c

923 /*

924 * Analog connectors may be hot-plugged unlike other connector

925 * types that don't support HPD. Only poll analog connectors.

926 */

927 use_polling |=

928 amdgpu_dm_connector->dc_link &&

^^^^^^^^^^^^^^

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References