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Vulnerability record · CVE-2025-39920 · published 1 October 2025

CVE-2025-39920: Linux kernel null pointer dereference vulnerability

Linux · Linux Kernel

In the Linux kernel, the following vulnerability has been resolved: pcmcia: Add error handling for add_interval() in do_validate_mem() In the do_validate_mem(), the call to add_interval() does not handle errors. If kmalloc() fails in add_interval(), it could result in a null pointer being inserted into the linked list, leading to illegal memory access when sub_interval() is called next. This patch adds an error handling for the add_interval(). If add_interval() returns an error, the function will return early with the error code.

5.5 CVSS 3.1 Medium EPSS 0.16% · top 95.3% 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
17 Jun 2026Last modified by NVD

Description

In the Linux kernel, the following vulnerability has been resolved: pcmcia: Add error handling for add_interval() in do_validate_mem() In the do_validate_mem(), the call to add_interval() does not handle errors. If kmalloc() fails in add_interval(), it could result in a null pointer being inserted into the linked list, leading to illegal memory access when sub_interval() is called next. This patch adds an error handling for the add_interval(). If add_interval() returns an error, the function will return early with the error code.

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/06b26e3099207c94b3d1be8565aedc6edc4f0a60 Patch
https://git.kernel.org/stable/c/289b58f8ff3198d091074a751d6b8f6827726f3e Patch
https://git.kernel.org/stable/c/369bf6e241506583f4ee7593c53b92e5a9f271b4 Patch
https://git.kernel.org/stable/c/4a81f78caa53e0633cf311ca1526377d9bff7479 Patch
https://git.kernel.org/stable/c/5b60ed401b47897352c520bc724c85aa908dedcc Patch
https://git.kernel.org/stable/c/85be7ef8c8e792a414940a38d94565dd48d2f236 Patch
https://git.kernel.org/stable/c/8699358b6ac99b8ccc97ed9e6e3669ef8958ef7b Patch
https://git.kernel.org/stable/c/ae184024ef31423e5beb44cf4f52999bbcf2fe5b Patch
https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html Mailing ListThird Party Advisory
https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html Mailing ListThird Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2025-39920), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.