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Unrated severityNVD Advisory· Published Sep 16, 2025· Updated Jan 14, 2026

Drivers: vmbus: Check for channel allocation before looking up relids

CVE-2023-53273

Description

In the Linux kernel, the following vulnerability has been resolved:

Drivers: vmbus: Check for channel allocation before looking up relids

relid2channel() assumes vmbus channel array to be allocated when called. However, in cases such as kdump/kexec, not all relids will be reset by the host. When the second kernel boots and if the guest receives a vmbus interrupt during vmbus driver initialization before vmbus_connect() is called, before it finishes, or if it fails, the vmbus interrupt service routine is called which in turn calls relid2channel() and can cause a null pointer dereference.

Print a warning and error out in relid2channel() for a channel id that's invalid in the second kernel.

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Affected products

128

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