CVE-2026-89823

Description

In the Linux kernel, the following vulnerability has been resolved: drm: fix race between partial drm_dev_register() failure and ioctl If drm_dev_register() fails after registering a minor (e.g. render minor registered, primary minor fails), userspace could have opened the first minor and entered a drm_dev_enter() critical section. Since the unplugged flag was never set, the ioctl proceeds while the error path tears down device resources. Fix this by introducing drm_dev_synchronize_unplug(), which sets the unplugged flag and waits for the SRCU barrier, ensuring all in-flight drm_dev_enter() critical sections complete before cleanup proceeds; call it on the error path of drm_dev_register().

References

• https://git.kernel.org/stable/c/19dbfe4d586aecfed121cb3fa62281761d9d341f
• https://git.kernel.org/stable/c/24d28d15c0f7f7d4a1c229f8730314f0f8758810
• https://git.kernel.org/stable/c/26d9162213952927cd59c0d94b7e0e992b347bec
• https://git.kernel.org/stable/c/2d1215a72159d00001e08dee162e27718934bee9
• https://git.kernel.org/stable/c/6729990df9e70623bf53f855b521ae71ca9cb278