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CVE-2025-39873

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: can: xilinx_can: xcan_write_frame(): fix use-after-free of transmitted SKB can_put_echo_skb() takes ownership of the SKB and it…

Published Sep 23, 2025CWE-416EPSS 0.16%

Overview

CVE-2025-39873 is a high-severity vulnerability. It was published on September 23, 2025 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, 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:

can: xilinx_can: xcan_write_frame(): fix use-after-free of transmitted SKB

can_put_echo_skb() takes ownership of the SKB and it may be freed

during or after the call.

However, xilinx_can xcan_write_frame() keeps using SKB after the call.

Fix that by only calling can_put_echo_skb() after the code is done

touching the SKB.

The tx_lock is held for the entire xcan_write_frame() execution and

also on the can_get_echo_skb() side so the order of operations does not

matter.

An earlier fix commit 3d3c817c3a40 ("can: xilinx_can: Fix usage of skb

memory") did not move the can_put_echo_skb() call far enough.

[mkl: add "commit" in front of sha1 in patch description]

[mkl: fix indention]

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/1139321161a3ba5e45e61e0738b37f42f20bc57aRefgit.kernel.org/stable/c/668cc1e3bb21101d074e430de1b7ba8fd10189e7Refgit.kernel.org/stable/c/725b33deebd6e4c96fe7893f384510a54258f28fRefgit.kernel.org/stable/c/94b050726288a56a6b8ff55aa641f2fedbd3b44cRefgit.kernel.org/stable/c/e202ffd9e54538ef67ec301ebd6d9da4823466c9Refgit.kernel.org/stable/c/ef79f00be72bd81d2e1e6f060d83cf7e425deee4Reflists.debian.org/debian-lts-announce/2025/10/msg00008.html

How CyberStrike helps

Frequently asked questions

What is CVE-2025-39873?

CVE-2025-39873 is a high-severity vulnerability. It was published on September 23, 2025 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2025-39873?

This vulnerability has a CVSS 3.1 base score of 7.8, 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-2025-39873?

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-2025-39873?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-39873 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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