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CVE-2025-21666

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: vsock: prevent null-ptr-deref in vsock_*[has_data|has_space] Recent reports have shown how we sometimes call vsock_*_has_data()…

Published Jan 31, 2025CWE-476EPSS 0.22%

Overview

CVE-2025-21666 is a medium-severity vulnerability. It was published on January 31, 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:

vsock: prevent null-ptr-deref in vsock_*[has_data|has_space]

Recent reports have shown how we sometimes call vsock_*_has_data()

when a vsock socket has been de-assigned from a transport (see attached

links), but we shouldn't.

Previous commits should have solved the real problems, but we may have

more in the future, so to avoid null-ptr-deref, we can return 0

(no space, no data available) but with a warning.

This way the code should continue to run in a nearly consistent state

and have a warning that allows us to debug future problems.

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/91751e248256efc111e52e15115840c35d85abafRefgit.kernel.org/stable/c/9e5fed46ccd2c34c5fa5a9c8825ce4823fdc853eRefgit.kernel.org/stable/c/b52e50dd4fabd12944172bd486a4f4853b7f74ddRefgit.kernel.org/stable/c/bc9c49341f9728c31fe248c5fbba32d2e81a092bRefgit.kernel.org/stable/c/c23d1d4f8efefb72258e9cedce29de10d057f8caRefgit.kernel.org/stable/c/daeac89cdb03d30028186f5ff7dc26ec8fa843e7Reflists.debian.org/debian-lts-announce/2025/03/msg00001.htmlReflists.debian.org/debian-lts-announce/2025/03/msg00002.htmlRefcert-portal.siemens.com/productcert/html/ssa-265688.html

How CyberStrike helps

Frequently asked questions

What is CVE-2025-21666?

CVE-2025-21666 is a medium-severity vulnerability. It was published on January 31, 2025 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2025-21666?

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-2025-21666?

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-2025-21666?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-21666 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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