Kernel Vulnerability in Linux Affecting vmclock Module Operations

CVE-2025-21769

What is CVE-2025-21769?

A vulnerability in the Linux kernel, specifically related to the vmclock module, has been identified which could lead to system instability. The absence of the .owner field in the vmclock_miscdev_fops could permit the module to be unloaded while a process is actively using /dev/vmclock0. This situation may cause unexpected behavior, including potential system crashes, as resources may not be appropriately managed when accessed concurrently.

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