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CVE-2023-53205

7.3 · HIGH

In the Linux kernel, the following vulnerability has been resolved: KVM: s390/diag: fix racy access of physical cpu number in diag 9c handler We do check for target CPU == -1, but this might chan…

Published Sep 15, 2025CWE-787EPSS 0.17%

Overview

CVE-2023-53205 is a high-severity vulnerability. It was published on September 15, 2025 and has a CVSS 3.1 base score of 7.3 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.3, rated HIGH. 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:

KVM: s390/diag: fix racy access of physical cpu number in diag 9c handler

We do check for target CPU == -1, but this might change at the time we

are going to use it. Hold the physical target CPU in a local variable to

avoid out-of-bound accesses to the cpu arrays.

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/0bc380beb78aa352eadbc21d934dd9606fcee808Refgit.kernel.org/stable/c/86bfb18bad60fc468e5f112cbbd918462a8dd435Refgit.kernel.org/stable/c/a9ccf140a2a03a0ae82be4bdfbdd17bdaea72ff5Refgit.kernel.org/stable/c/dc7e0192c470a53d847c79a2796f9ac429477a26

How CyberStrike helps

Frequently asked questions

What is CVE-2023-53205?

CVE-2023-53205 is a high-severity vulnerability. It was published on September 15, 2025 and has a CVSS 3.1 base score of 7.3 (HIGH).

How severe is CVE-2023-53205?

This vulnerability has a CVSS 3.1 base score of 7.3, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2023-53205?

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-2023-53205?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2023-53205 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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