CVE-2026-74732
Received Received - Intake

AMD Display Driver Null Pointer Dereference

Publication date: 2026-08-22

Last updated on: 2026-08-22

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: Check for tg ops in dce110_set_avmute Some older DCE timing generators do not implement is_tg_enabled in their ops table. Calling it unconditionally when waiting for AV mute frames causes a NULL pointer dereference on Southern Islands dGPUs when turning the display off over HDMI. Check that tg and the required ops exist before waiting for frames. (cherry picked from commit 2686a0c0aaa07bec2e24131835cf27b5fd4935a5)

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Meta Information

Published
2026-08-22
Last Modified
2026-08-22
Generated
2026-08-22
AI Q&A
2026-08-22
EPSS Evaluated
N/A
NVD
CVE-2026-74732
EUVD
EUVD-2026-64419

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
linux_kernel linux_kernel *

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Exploitability

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KEV
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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This is a Linux kernel vulnerability in the AMD display driver. It involves a NULL pointer dereference in the drm/amd/display module when handling display power states over HDMI. The issue occurs because some older DCE timing generators lack the is_tg_enabled operation in their function table, leading to crashes when the display is turned off.

Detection Guidance

This vulnerability affects the Linux kernel's AMD display driver (drm/amd/display) and is related to a NULL pointer dereference in Southern Islands dGPUs. Detection requires checking kernel logs for NULL pointer dereference errors in the AMD display driver module. Use commands like 'dmesg | grep -i amdgpu' or 'journalctl -k | grep -i amdgpu' to inspect kernel logs for errors.

Impact Analysis

If you use a Southern Islands dGPU with an HDMI display, this vulnerability could cause system crashes or instability when turning off the display. It may lead to unexpected reboots or freezes, disrupting your workflow.

Mitigation Strategies

Immediate mitigation involves updating the Linux kernel to a patched version that includes the fix for this vulnerability. Check your distribution's package manager for kernel updates (e.g., 'apt upgrade linux-image' for Debian/Ubuntu or 'yum update kernel' for RHEL/CentOS). If no patch is available, consider disabling the affected AMD display driver module temporarily.

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