cve 2025 21976

About this tag
CVE-2025-21976 is a kernel vulnerability in the Linux Hyper-V framebuffer driver (hyperv_fb) that affects virtual machines running on Microsoft Hyper-V. The issue involves an unsafe driver teardown process that could trigger a kernel warning and leak framebuffer resources when the device is removed. A fix has been implemented to ensure safe teardown, preventing resource leaks and kernel warnings. This tag covers discussions about the vulnerability, its impact on Linux VMs under Hyper-V, and the patch that addresses it.

  1. Linux Hyper-V Framebuffer Fix: Safe Driver Teardown

    When a Linux virtual machine runs on Microsoft Hyper‑V, the hyperv_fb framebuffer driver provides the synthetic display surface that makes console output and early-boot graphics available to the host and guest; a recent kernel fix for CVE-2025-21976 changes how that driver tears down its...
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