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CVE-2025-39902

7.1 · HIGH

In the Linux kernel, the following vulnerability has been resolved: mm/slub: avoid accessing metadata when pointer is invalid in object_err() object_err() reports details of an object for further…

Published Oct 1, 2025CWE-476EPSS 0.16%

Overview

CVE-2025-39902 is a high-severity vulnerability. It was published on October 1, 2025 and has a CVSS 3.1 base score of 7.1 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.1, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

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

mm/slub: avoid accessing metadata when pointer is invalid in object_err()

object_err() reports details of an object for further debugging, such as

the freelist pointer, redzone, etc. However, if the pointer is invalid,

attempting to access object metadata can lead to a crash since it does

not point to a valid object.

One known path to the crash is when alloc_consistency_checks()

determines the pointer to the allocated object is invalid because of a

freelist corruption, and calls object_err() to report it. The debug code

should report and handle the corruption gracefully and not crash in the

process.

In case the pointer is NULL or check_valid_pointer() returns false for

the pointer, only print the pointer value and skip accessing metadata.

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/0ef7058b4dc6fcef622ac23b45225db57f17b83fRefgit.kernel.org/stable/c/1f0797f17927b5cad0fb7eced422f9a7c30a3191Refgit.kernel.org/stable/c/3baa1da473e6e50281324ff1d332d1a07a3bb02eRefgit.kernel.org/stable/c/7e287256904ee796c9477e3ec92b07f236481ef3Refgit.kernel.org/stable/c/872f2c34ff232af1e65ad2df86d61163c8ffad42Refgit.kernel.org/stable/c/b4efccec8d06ceb10a7d34d7b1c449c569d53770Refgit.kernel.org/stable/c/dda6ec365ab04067adae40ef17015db447e90736Refgit.kernel.org/stable/c/f66012909e7bf383fcdc5850709ed5716073fdc4Reflists.debian.org/debian-lts-announce/2025/10/msg00007.htmlReflists.debian.org/debian-lts-announce/2025/10/msg00008.html

How CyberStrike helps

Frequently asked questions

What is CVE-2025-39902?

CVE-2025-39902 is a high-severity vulnerability. It was published on October 1, 2025 and has a CVSS 3.1 base score of 7.1 (HIGH).

How severe is CVE-2025-39902?

This vulnerability has a CVSS 3.1 base score of 7.1, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2025-39902?

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-2025-39902?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-39902 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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