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CVE-2025-39848
ax25: properly unshare skbs in ax25_kiss_rcv()
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()").

INFO

Published Date :

Sept. 19, 2025, 4:15 p.m.

Last Modified :

Sept. 19, 2025, 4:15 p.m.

Remotely Exploit :

No

Source :

416baaa9-dc9f-4396-8d5f-8c081fb06d67
Affected Products

The following products are affected by CVE-2025-39848 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Linux linux_kernel
: Total Affected Vendor : 1 | Products : 1
Solution
Address skb sharing issues in ax25_kiss_rcv() to prevent crashes.
  • Apply the fix for skb sharing in ax25_kiss_rcv().
  • Ensure input skbs are checked for sharing.
  • Review related commits for similar issues.
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2025-39848.

URL Resource
https://git.kernel.org/stable/c/01a2984cb803f2d487b7074f9718db2bf3531f69
https://git.kernel.org/stable/c/2bd0f67212908243ce88e35bf69fa77155b47b14
https://git.kernel.org/stable/c/42b46684e2c78ee052d8c2ee8d9c2089233c9094
https://git.kernel.org/stable/c/5b079be1b9da49ad88fc304c874d4be7085f7883
https://git.kernel.org/stable/c/7d449b7a6c8ee434d10a483feed7c5c50108cf56
https://git.kernel.org/stable/c/8156210d36a43e76372312c87eb5ea3dbb405a85
https://git.kernel.org/stable/c/89064cf534bea4bb28c83fe6bbb26657b19dd5fe
https://git.kernel.org/stable/c/b1c71d674a308d2fbc83efcf88bfc4217a86aa17
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2025-39848 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2025-39848 weaknesses.

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2025-39848 vulnerability anywhere in the article.

Results are limited to the first 20 news articles due to potential performance issues.

The following table lists the changes that have been made to the CVE-2025-39848 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Sep. 19, 2025

    Action Type Old Value New Value
    Added 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()").
    Added Reference https://git.kernel.org/stable/c/01a2984cb803f2d487b7074f9718db2bf3531f69
    Added Reference https://git.kernel.org/stable/c/2bd0f67212908243ce88e35bf69fa77155b47b14
    Added Reference https://git.kernel.org/stable/c/42b46684e2c78ee052d8c2ee8d9c2089233c9094
    Added Reference https://git.kernel.org/stable/c/5b079be1b9da49ad88fc304c874d4be7085f7883
    Added Reference https://git.kernel.org/stable/c/7d449b7a6c8ee434d10a483feed7c5c50108cf56
    Added Reference https://git.kernel.org/stable/c/8156210d36a43e76372312c87eb5ea3dbb405a85
    Added Reference https://git.kernel.org/stable/c/89064cf534bea4bb28c83fe6bbb26657b19dd5fe
    Added Reference https://git.kernel.org/stable/c/b1c71d674a308d2fbc83efcf88bfc4217a86aa17
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
Vulnerability Scoring Details
No CVSS metrics available for this vulnerability.