Null Pointer Dereference in Linux Kernel vmbus Driver Impacting Multiple Environments

CVE-2023-53273

What is CVE-2023-53273?

The vulnerability in the Linux kernel's vmbus driver can lead to a null pointer dereference when channel allocation is not adequately verified. Specifically, the function relid2channel() assumes that the vmbus channel array has been allocated at the moment it's called. If a second kernel is booted in scenarios such as kdump/kexec, not all relids may reset as expected by the host. This situation arises if a guest receives a vmbus interrupt during vmbus driver initialization, particularly before vmbus_connect() concludes, or if it fails entirely. Consequently, this issue raises significant concerns for systems relying on vmbus, prompting the need for stringent warnings and error handling in relid2channel() to address invalid channel IDs.

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