CVE-2026-74422 drm/rockchip: inno-hdmi: Switch to drmm_kzalloc()
A use-after-free in the Rockchip HDMI driver allows local attackers to cause a system crash or potentially execute code.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-74422?
CVE-2026-74422 is an use after free vulnerability in Linux, published on 15 Aug 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official 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.
Which versions are affected by CVE-2026-74422?
How do I fix CVE-2026-74422?
Apply the vendor's patch.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2026-74422 being exploited?
There is no known exploitation of CVE-2026-74422 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-74422, GHSA-j9hg-prqv-m4rx, UBUNTU-CVE-2026-74422.