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CVE-2025-21947

8.1 · HIGH

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix type confusion via race condition when using ipc_msg_send_request req->handle is allocated using ksmbd_acquire_id(&i…

Published Apr 1, 2025CWE-362EPSS 0.38%

Overview

CVE-2025-21947 is a high-severity vulnerability. It was published on April 1, 2025 and has a CVSS 3.1 base score of 8.1 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.1, rated HIGH. 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:

ksmbd: fix type confusion via race condition when using ipc_msg_send_request

req->handle is allocated using ksmbd_acquire_id(&ipc_ida), based on

ida_alloc. req->handle from ksmbd_ipc_login_request and

FSCTL_PIPE_TRANSCEIVE ioctl can be same and it could lead to type confusion

between messages, resulting in access to unexpected parts of memory after

an incorrect delivery. ksmbd check type of ipc response but missing add

continue to check next ipc reponse.

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/1e8833c03a38e1d5d5df6484e3f670a2fd38fb76Refgit.kernel.org/stable/c/3cb2b2e41541fe6f9cc55ca22d4c0bd260498aeaRefgit.kernel.org/stable/c/6321bbda4244b93802d61cfe0887883aae322f4bRefgit.kernel.org/stable/c/76861630b29e51373e73e7b00ad0d467b6941162Refgit.kernel.org/stable/c/e2ff19f0b7a30e03516e6eb73b948e27a55bc9d2Reflists.debian.org/debian-lts-announce/2025/05/msg00045.html

How CyberStrike helps

Frequently asked questions

What is CVE-2025-21947?

CVE-2025-21947 is a high-severity vulnerability. It was published on April 1, 2025 and has a CVSS 3.1 base score of 8.1 (HIGH).

How severe is CVE-2025-21947?

This vulnerability has a CVSS 3.1 base score of 8.1, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2025-21947?

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-2025-21947?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-21947 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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