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CVE-2025-38191

7.5 · HIGH

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix null pointer dereference in destroy_previous_session If client set ->PreviousSessionId on kerberos session setup sta…

Published Jul 4, 2025CWE-476EPSS 1.42%

Overview

CVE-2025-38191 is a high-severity vulnerability. It was published on July 4, 2025 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, 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 null pointer dereference in destroy_previous_session

If client set ->PreviousSessionId on kerberos session setup stage,

NULL pointer dereference error will happen. Since sess->user is not

set yet, It can pass the user argument as NULL to destroy_previous_session.

sess->user will be set in ksmbd_krb5_authenticate(). So this patch move

calling destroy_previous_session() after ksmbd_krb5_authenticate().

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/076f1adefb9837977af7ed233883842ddc446644Refgit.kernel.org/stable/c/0902625a24eea7fdc187faa5d97df244d159dd6eRefgit.kernel.org/stable/c/1193486dffb7432a09f57f5d09049b4d4123538bRefgit.kernel.org/stable/c/281afc52e2961cd5dd8326ebc9c5bc40904c0468Refgit.kernel.org/stable/c/7ac5b66acafcc9292fb935d7e03790f2b8b2dc0eRefwww.zerodayinitiative.com/advisories/ZDI-25-610/Reflists.debian.org/debian-lts-announce/2025/10/msg00008.html

How CyberStrike helps

Frequently asked questions

What is CVE-2025-38191?

CVE-2025-38191 is a high-severity vulnerability. It was published on July 4, 2025 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2025-38191?

This vulnerability has a CVSS 3.1 base score of 7.5, 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-2025-38191?

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-2025-38191?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-38191 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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