CVE-2025-21978 drm/hyperv: Fix address space leak when Hyper-V DRM device is removed

In the Linux kernel, the following vulnerability has been resolved: drm/hyperv: Fix address space leak when Hyper-V DRM device is removed When a Hyper-V DRM device is probed, the driver allocates MMIO space for the vram, and maps it cacheable. If the device removed, or in the error path for devic...

Design/Logic Flaw

Failure to verify SEV-ES TMR is not in MMIO space, SEV-ES FW could result in a potential loss of integrity or availability...

Denial Of Service (DoS)

kernel is vulnerable to denial of service DoS. The vulnerability exists as in vfio, access to disabled MMIO space of some devices may lead to DoS scenario...