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CVE-2025-21856

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: s390/ism: add release function for struct device According to device_release() in /drivers/base/core.c, a device without a rele…

Published Mar 12, 2025CWE-416EPSS 0.22%

Overview

CVE-2025-21856 is a high-severity vulnerability. It was published on March 12, 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:

s390/ism: add release function for struct device

According to device_release() in /drivers/base/core.c,

a device without a release function is a broken device

and must be fixed.

The current code directly frees the device after calling device_add()

without waiting for other kernel parts to release their references.

Thus, a reference could still be held to a struct device,

e.g., by sysfs, leading to potential use-after-free

issues if a proper release function is not set.

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/0505ff2936f166405d81d0d454a81d9c14124344Refgit.kernel.org/stable/c/915e34d5ad35a6a9e56113f852ade4a730fb88f0Refgit.kernel.org/stable/c/940d15254d2216b585558bcf36312da50074e711Refgit.kernel.org/stable/c/e26e8ac27351f457091459a0a355bacd06d5bb2b

How CyberStrike helps

Frequently asked questions

What is CVE-2025-21856?

CVE-2025-21856 is a high-severity vulnerability. It was published on March 12, 2025 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2025-21856?

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-2025-21856?

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-2025-21856?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-21856 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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