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CVE-2025-38665

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: can: netlink: can_changelink(): fix NULL pointer deref of struct can_priv::do_set_mode Andrei Lalaev reported a NULL pointer de…

Published Aug 22, 2025CWE-476EPSS 0.15%

Overview

CVE-2025-38665 is a medium-severity vulnerability. It was published on August 22, 2025 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. 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:

can: netlink: can_changelink(): fix NULL pointer deref of struct can_priv::do_set_mode

Andrei Lalaev reported a NULL pointer deref when a CAN device is

restarted from Bus Off and the driver does not implement the struct

can_priv::do_set_mode callback.

There are 2 code path that call struct can_priv::do_set_mode:

- directly by a manual restart from the user space, via

can_changelink()

- delayed automatic restart after bus off (deactivated by default)

To prevent the NULL pointer deference, refuse a manual restart or

configure the automatic restart delay in can_changelink() and report

the error via extack to user space.

As an additional safety measure let can_restart() return an error if

can_priv::do_set_mode is not set instead of dereferencing it

unchecked.

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/0ca816a96fdcf32644c80cbe7a82c7b6ce6ddda5Refgit.kernel.org/stable/c/6acceb46180f9e160d4f0c56fcaf39ba562822aeRefgit.kernel.org/stable/c/6bbcf37c5114926c99a1d1e6993a5b35689d2599Refgit.kernel.org/stable/c/c1f3f9797c1f44a762e6f5f72520b2e520537b52Refgit.kernel.org/stable/c/cf81a60a973358dea163f6b14062f17831ceb894Reflists.debian.org/debian-lts-announce/2025/10/msg00008.html

How CyberStrike helps

Frequently asked questions

What is CVE-2025-38665?

CVE-2025-38665 is a medium-severity vulnerability. It was published on August 22, 2025 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2025-38665?

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2025-38665?

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-2025-38665?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-38665 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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