Null Pointer Dereference Vulnerability in Linux Kernel vsock Related Functions

CVE-2025-21670

What is CVE-2025-21670?

A vulnerability in the Linux kernel's vsock handling can cause a null pointer dereference error due to the absence of an assigned transport. If a socket is in a state where the transport is not set, such as after a connection failure, it may lead to unsafe kernel operations. This flaw can be triggered in various situations, particularly during socket message retrieval, and poses a risk of system instability and unexpected behaviors. To mitigate this risk, it is crucial to ensure checks on the transport layer are properly implemented.

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