CVE-2025-21978

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

Description

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.

N/A

CVSS

Severity:

EPSS 0.04%

Affected: Linux Linux

References

Link	Tags
https://git.kernel.org/stable/c/c40cd24bfb9bfbb315c118ca14ebe6cf52e2dd1e
https://git.kernel.org/stable/c/ad27b4a51495490b815580d9b935e8eee14d1a9c
https://git.kernel.org/stable/c/24f1bbfb2be77dad82489c1468bbb14312aab129
https://git.kernel.org/stable/c/158242b56bf465a73e1edeac0fe828a8acad4499
https://git.kernel.org/stable/c/aed709355fd05ef747e1af24a1d5d78cd7feb81e

Frequently Asked Questions

What is the severity of CVE-2025-21978?: CVE-2025-21978 has not yet been assigned a CVSS score.
How to fix CVE-2025-21978?: To fix CVE-2025-21978, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2025-21978 being actively exploited in the wild?: As for now, there are no information to confirm that CVE-2025-21978 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2025-21978?: CVE-2025-21978 affects Linux Linux, Linux Linux.

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