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CVE-2025-37947

8.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: ksmbd: prevent out-of-bounds stream writes by validating *pos ksmbd_vfs_stream_write() did not validate whether the write offse…

Published May 20, 2025CWE-787EPSS 0.65%

Overview

CVE-2025-37947 is a high-severity vulnerability. It was published on May 20, 2025 and has a CVSS 3.1 base score of 8.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical description

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

ksmbd: prevent out-of-bounds stream writes by validating *pos

ksmbd_vfs_stream_write() did not validate whether the write offset

(*pos) was within the bounds of the existing stream data length (v_len).

If *pos was greater than or equal to v_len, this could lead to an

out-of-bounds memory write.

This patch adds a check to ensure *pos is less than v_len before

proceeding. If the condition fails, -EINVAL is returned.

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/04c8a38c60346bb5a7c49b276de7233f703ce9cbRefgit.kernel.org/stable/c/0ca6df4f40cf4c32487944aaf48319cb6c25acccRefgit.kernel.org/stable/c/7f61da79df86fd140c7768e668ad846bfa7ec8e1Refgit.kernel.org/stable/c/d62ba16563a86aae052f96d270b3b6f78fca154cRefgit.kernel.org/stable/c/e6356499fd216ed6343ae0363f4c9303f02c5034Reflists.debian.org/debian-lts-announce/2025/08/msg00010.htmlGitHubgithub.com/doyensec/KSMBD-CVE-2025-37947/blob/main/CVE-2025-37947.c

How CyberStrike helps

Frequently asked questions

What is CVE-2025-37947?

CVE-2025-37947 is a high-severity vulnerability. It was published on May 20, 2025 and has a CVSS 3.1 base score of 8.8 (HIGH).

How severe is CVE-2025-37947?

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2025-37947?

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-2025-37947?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-37947 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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