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CVE-2025-21927

9.8 · CRITICAL

In the Linux kernel, the following vulnerability has been resolved: nvme-tcp: fix potential memory corruption in nvme_tcp_recv_pdu() nvme_tcp_recv_pdu() doesn't check the validity of the header l…

Published Apr 1, 2025CWE-787EPSS 0.50%

Overview

CVE-2025-21927 is a critical-severity vulnerability. It was published on April 1, 2025 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

nvme-tcp: fix potential memory corruption in nvme_tcp_recv_pdu()

nvme_tcp_recv_pdu() doesn't check the validity of the header length.

When header digests are enabled, a target might send a packet with an

invalid header length (e.g. 255), causing nvme_tcp_verify_hdgst()

to access memory outside the allocated area and cause memory corruptions

by overwriting it with the calculated digest.

Fix this by rejecting packets with an unexpected header length.

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/22b06c89aa6b2d1ecb8aea72edfb9d53af8d5126Refgit.kernel.org/stable/c/9fbc953d6b38bc824392e01850f0aeee3b348722Refgit.kernel.org/stable/c/ad95bab0cd28ed77c2c0d0b6e76e03e031391064

How CyberStrike helps

Frequently asked questions

What is CVE-2025-21927?

CVE-2025-21927 is a critical-severity vulnerability. It was published on April 1, 2025 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

How severe is CVE-2025-21927?

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2025-21927?

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-2025-21927?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-21927 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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