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CVE-2023-53254

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: cacheinfo: Fix shared_cpu_map to handle shared caches at different levels The cacheinfo sets up the shared_cpu_map by checking…

Published Sep 15, 2025CWE-125EPSS 0.15%

Overview

CVE-2023-53254 is a high-severity vulnerability. It was published on September 15, 2025 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, 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:

cacheinfo: Fix shared_cpu_map to handle shared caches at different levels

The cacheinfo sets up the shared_cpu_map by checking whether the caches

with the same index are shared between CPUs. However, this will trigger

slab-out-of-bounds access if the CPUs do not have the same cache hierarchy.

Another problem is the mismatched shared_cpu_map when the shared cache does

not have the same index between CPUs.

CPU0 I D L3

index 0 1 2 x

^ ^ ^ ^

index 0 1 2 3

CPU1 I D L2 L3

This patch checks each cache is shared with all caches on other CPUs.

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/198102c9103fc78d8478495971947af77edb05c1Refgit.kernel.org/stable/c/2f588d0345d69a35e451077afed428fd057a5e34Refgit.kernel.org/stable/c/dea49f2993f57d8a2df2cacb0bf649ef49b28879

How CyberStrike helps

Frequently asked questions

What is CVE-2023-53254?

CVE-2023-53254 is a high-severity vulnerability. It was published on September 15, 2025 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2023-53254?

This vulnerability has a CVSS 3.1 base score of 7.8, 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-2023-53254?

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-2023-53254?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2023-53254 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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