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CVE-2023-53273

5.5 · MEDIUM

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 allocat…

Published Sep 16, 2025CWE-476EPSS 0.16%

Overview

CVE-2023-53273 is a medium-severity vulnerability. It was published on September 16, 2025 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/176c6b4889195fbe7016d9401175b48c5c9edf68Refgit.kernel.org/stable/c/1eb65c8687316c65140b48fad27133d583178e15Refgit.kernel.org/stable/c/8c3f0ae5435fd20bb1e3a8308488aa6ac33151eeRefgit.kernel.org/stable/c/a5c44f3446a0565139b7d8abc78f58b86c398123Refgit.kernel.org/stable/c/c373e49fbb87aa177819866ed9194ebc5414dfd6

How CyberStrike helps

Frequently asked questions

What is CVE-2023-53273?

CVE-2023-53273 is a medium-severity vulnerability. It was published on September 16, 2025 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2023-53273?

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2023-53273?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2023-53273?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2023-53273 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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