CVE-2026-74422
Received Received - Intake

Use-After-Free in Rockchip DRM Inno-HDMI Driver

Publication date: 2026-08-15

Last updated on: 2026-08-15

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: drm/rockchip: inno-hdmi: Switch to drmm_kzalloc() Driver makes use of drmm_encoder_init() to initialize the encoder and automatically handle the cleanup by registering drm_encoder_cleanup() with drmm_add_action(). However, the internal structure containing the encoder part gets allocated with devm_kzalloc(), which happens while component_bind_all() is being called from Rockchip DRM driver. The component framework further ensures it is deallocated as part of releasing all the resources claimed during bind, which is triggered from component_unbind_all(). When the reference to the DRM device gets eventually dropped via drm_dev_put() in rockchip_drm_unbind(), drmm_encoder_alloc_release() attempts to access the now released encoder structure, leading to use-after-free. Ensure driver's internal structure is still reachable on encoder cleanup by switching from a device-managed allocation to a drm-managed one.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published
2026-08-15
Last Modified
2026-08-15
Generated
2026-08-15
AI Q&A
2026-08-15
EPSS Evaluated
N/A
NVD
CVE-2026-74422
EUVD
EUVD-2026-59569

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
rockchip drm *

Helpful Resources

Exploitability

CWE
CWE Icon
KEV
KEV Icon
CWE ID Description
CWE-UNKNOWN

Attack-Flow Graph

AI Quick Actions

Instant insights powered by AI
Executive Summary

This vulnerability is a use-after-free issue in the Linux kernel's Rockchip DRM driver. It occurs when the driver's internal structure for the encoder is allocated with devm_kzalloc() but later accessed after being freed during drm_dev_put(). The issue arises because the encoder cleanup function tries to access the encoder structure after it has already been released by the component framework.

Detection Guidance

This vulnerability is specific to the Linux kernel's Rockchip DRM driver and does not have network-based detection methods. Detection requires checking the kernel version and Rockchip DRM driver code for the use-after-free issue in drm/rockchip/inno-hdmi. Use commands like 'uname -a' to check kernel version and 'grep -r inno-hdmi /lib/modules/$(uname -r)/' to inspect the driver.

Impact Analysis

This vulnerability could lead to system instability, crashes, or potential privilege escalation if exploited. Systems using the affected Rockchip DRM driver may experience kernel panics or unexpected behavior due to the use-after-free condition.

Mitigation Strategies

Apply the Linux kernel patch that resolves this issue by switching to drmm_kzalloc() for the Rockchip DRM driver. Update your kernel to a version containing the fix or apply the patch manually if available. Monitor vendor advisories for Rockchip-specific updates.

Chat Assistant

Ask questions about this CVE
Hi! I’m here to help you understand CVE-2026-74422. Ask me anything about the vulnerability, its impact, or mitigation strategies.
0/70

EPSS Chart