Use-After-Free Vulnerability in Linux Kernel Affecting NBD Configuration

CVE-2025-21731

What is CVE-2025-21731?

A use-after-free vulnerability exists in the Linux Kernel that can be exploited when the NBD (Network Block Device) configuration is unexpectedly released while still in use. This issue arises during the reconfiguration process, leading to potential access to freed memory resources. Proper handling during disconnect operations is essential to maintain the stability and security of NBD connections. The vulnerability is resolved by ensuring that the NBD state is properly managed, preventing the reconfiguration attempt from succeeding post-disconnection. Users are advised to update their Linux Kernel to the latest version to mitigate this risk.

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