CVE-2025-21978

CVE-2025-21978: vulnerability in Linux

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

Published · Updated

3Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackepss 0.2%
exploitation probability
0.2%top 92% of all CVEs
observed exploitation
nono source reports it
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 device probing, the MMIO space is released but no unmap is done. Consequently the kernel address space for the mapping is leaked. Fix this by adding iounmap() calls in the device removal path, and in the error path during device probing.
Affected products
Linux · Linux
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References
https://git.kernel.org/stable/c/158242b56bf465a73e1edeac0fe828a8acad4499https://git.kernel.org/stable/c/24f1bbfb2be77dad82489c1468bbb14312aab129https://git.kernel.org/stable/c/ad27b4a51495490b815580d9b935e8eee14d1a9chttps://git.kernel.org/stable/c/aed709355fd05ef747e1af24a1d5d78cd7feb81ehttps://git.kernel.org/stable/c/c40cd24bfb9bfbb315c118ca14ebe6cf52e2dd1ehttps://lists.debian.org/debian-lts-announce/2025/05/msg00045.html