Kernel Memory Management Issue in Rockchip DRM Driver

CVE-2026-74421

What is CVE-2026-74421?

A memory management vulnerability exists in the Rockchip DRM driver, specifically related to the handling of encoder structures. The issue arises from improper allocation and deallocation methods, where the driver uses a device-managed allocation that may lead to a use-after-free situation. When resources are released, an attempt is made to access a now-invalid memory reference, which can result in system instability or unauthorized access to memory. The fix involves switching to a DRM-managed allocation approach, ensuring the internal structure remains valid throughout the lifecycle of the encoder cleanup process.

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