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CVE-2025-37899

8.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix use-after-free in session logoff The sess->user object can currently be in use by another thread, for example if ano…

Published May 20, 2025CWE-416EPSS 0.88%

Overview

CVE-2025-37899 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: fix use-after-free in session logoff

The sess->user object can currently be in use by another thread, for

example if another connection has sent a session setup request to

bind to the session being free'd. The handler for that connection could

be in the smb2_sess_setup function which makes use of sess->user.

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/02d16046cd11a5c037b28c12ffb818c56dd3ef43Refgit.kernel.org/stable/c/2fc9feff45d92a92cd5f96487655d5be23fb7e2bRefgit.kernel.org/stable/c/70ad6455139e26e85f48f95d0e21f351c1909342Refgit.kernel.org/stable/c/931dc8a3670f71c45c0b1379ea4e92dafbda1acaRefgit.kernel.org/stable/c/d5ec1d79509b3ee01de02c236f096bc050221b7fRefnews.ycombinator.com/item?id=44081338Refsean.heelan.io/2025/05/22/how-i-used-o3-to-find-cve-2025-37899-a-remote-zeroday-vulnerability-in-the-linux-kernels-smb-implementation/

How CyberStrike helps

Frequently asked questions

What is CVE-2025-37899?

CVE-2025-37899 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-2025-37899?

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-2025-37899?

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-2025-37899?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-37899 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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