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Vulnerability record · CVE-2025-39902 · published 1 October 2025

CVE-2025-39902: Linux kernel null pointer dereference vulnerability

Linux · Linux Kernel

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.

5.5 CVSS 3.1 Medium EPSS 0.16% · top 95.1% CWE-476 · NULL pointer dereference
5.5CVSS 3.1 base score
0.16%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
10References
30 Jul 2026Last modified by NVD

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.

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/0ef7058b4dc6fcef622ac23b45225db57f17b83f Patch
https://git.kernel.org/stable/c/1f0797f17927b5cad0fb7eced422f9a7c30a3191 Patch
https://git.kernel.org/stable/c/3baa1da473e6e50281324ff1d332d1a07a3bb02e Patch
https://git.kernel.org/stable/c/7e287256904ee796c9477e3ec92b07f236481ef3 Patch
https://git.kernel.org/stable/c/872f2c34ff232af1e65ad2df86d61163c8ffad42 Patch
https://git.kernel.org/stable/c/b4efccec8d06ceb10a7d34d7b1c449c569d53770 Patch
https://git.kernel.org/stable/c/dda6ec365ab04067adae40ef17015db447e90736 Patch
https://git.kernel.org/stable/c/f66012909e7bf383fcdc5850709ed5716073fdc4 Patch
https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html Third Party Advisory
https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2025-39902), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.