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CVE-2025-39848

8.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: ax25: properly unshare skbs in ax25_kiss_rcv() Bernard Pidoux reported a regression apparently caused by commit c353e8983e0d ("…

Published Sep 19, 2025CWE-401EPSS 0.24%

Overview

CVE-2025-39848 is a high-severity vulnerability. It was published on September 19, 2025 and has a CVSS 3.1 base score of 8.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

Technical description

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

ax25: properly unshare skbs in ax25_kiss_rcv()

Bernard Pidoux reported a regression apparently caused by commit

c353e8983e0d ("net: introduce per netns packet chains").

skb->dev becomes NULL and we crash in __netif_receive_skb_core().

Before above commit, different kind of bugs or corruptions could happen

without a major crash.

But the root cause is that ax25_kiss_rcv() can queue/mangle input skb

without checking if this skb is shared or not.

Many thanks to Bernard Pidoux for his help, diagnosis and tests.

We had a similar issue years ago fixed with commit 7aaed57c5c28

("phonet: properly unshare skbs in phonet_rcv()").

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/01a2984cb803f2d487b7074f9718db2bf3531f69Refgit.kernel.org/stable/c/2bd0f67212908243ce88e35bf69fa77155b47b14Refgit.kernel.org/stable/c/42b46684e2c78ee052d8c2ee8d9c2089233c9094Refgit.kernel.org/stable/c/5b079be1b9da49ad88fc304c874d4be7085f7883Refgit.kernel.org/stable/c/7d449b7a6c8ee434d10a483feed7c5c50108cf56Refgit.kernel.org/stable/c/8156210d36a43e76372312c87eb5ea3dbb405a85Refgit.kernel.org/stable/c/89064cf534bea4bb28c83fe6bbb26657b19dd5feRefgit.kernel.org/stable/c/b1c71d674a308d2fbc83efcf88bfc4217a86aa17Reflists.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-2025-39848?

CVE-2025-39848 is a high-severity vulnerability. It was published on September 19, 2025 and has a CVSS 3.1 base score of 8.8 (HIGH).

How severe is CVE-2025-39848?

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2025-39848?

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-2025-39848?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-39848 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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