VDB-325028 · CVE-2025-39848 · Nessus 265710

Linux Kernel up to 6.17-rc4 ax25 ax25_kiss_rcv denial of service

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5.5	$0-$5k	0.00

Summaryinfo

A vulnerability was found in Linux Kernel up to 6.17-rc4 and classified as critical. Affected by this vulnerability is the function ax25_kiss_rcv of the component ax25. Such manipulation leads to denial of service. This vulnerability is listed as CVE-2025-39848. There is no available exploit. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, has been found in Linux Kernel up to 6.17-rc4. Affected by this issue is the function ax25_kiss_rcv of the component ax25. The manipulation with an unknown input leads to a denial of service vulnerability. Using CWE to declare the problem leads to CWE-404. The product does not release or incorrectly releases a resource before it is made available for re-use. Impacted is availability. CVE summarizes:

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()").

The advisory is shared for download at git.kernel.org. This vulnerability is handled as CVE-2025-39848 since 04/16/2025. There are known technical details, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 265710 (Debian dsa-6008 : ata-modules-6.12.31-armmp-di - security update), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 5.4.299, 5.10.243, 5.15.192, 6.1.151, 6.6.105, 6.12.46, 6.16.6 or 6.17-rc5 eliminates this vulnerability. Applying the patch 42b46684e2c78ee052d8c2ee8d9c2089233c9094/5b079be1b9da49ad88fc304c874d4be7085f7883/2bd0f67212908243ce88e35bf69fa77155b47b14/01a2984cb803f2d487b7074f9718db2bf3531f69/7d449b7a6c8ee434d10a483feed7c5c50108cf56/89064cf534bea4bb28c83fe6bbb26657b19dd5fe/b1c71d674a308d2fbc83efcf88bfc4217a86aa17/8156210d36a43e76372312c87eb5ea3dbb405a85 is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the databases at Tenable (265710) and CERT Bund (WID-SEC-2025-2099). Once again VulDB remains the best source for vulnerability data.

Affected

Debian Linux
Amazon Linux 2
Red Hat Enterprise Linux
Ubuntu Linux
SUSE Linux
Oracle Linux
IBM QRadar SIEM
SUSE openSUSE
RESF Rocky Linux
Open Source Linux Kernel
Dell Secure Connect Gateway
Dell NetWorker
Dell ECS

Productinfo

Type

Operating System

Vendor

Linux

Name

Kernel

Version

License

open-source

Website

Vendor: https://www.kernel.org/

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.6
VulDB Meta Temp Score: 5.5

VulDB Base Score: 5.7
VulDB Temp Score: 5.5
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 5.5
NVD Vector: 🔒

CVSSv2info

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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Denial of service
CWE: CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: Partially

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 265710
Nessus Name: Debian dsa-6008 : ata-modules-6.12.31-armmp-di - security update

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Timelineinfo

04/16/2025 CVE reserved
09/19/2025 +156 days Advisory disclosed
09/19/2025 +0 days VulDB entry created
06/24/2026 +278 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2025-39848 (🔒)
GCVE (CVE): GCVE-0-2025-39848
GCVE (VulDB): GCVE-100-325028
CERT Bund: WID-SEC-2025-2099 - Linux Kernel: Mehrere Schwachstellen

Entryinfo

Created: 09/19/2025 18:09
Updated: 06/24/2026 10:28
Changes: 09/19/2025 18:09 (59), 09/23/2025 18:31 (2), 10/20/2025 20:11 (7), 11/03/2025 12:45 (1), 11/12/2025 04:34 (1), 11/29/2025 07:12 (1), 12/22/2025 10:25 (1), 01/20/2026 17:56 (10), 06/24/2026 10:28 (1)
Complete: 🔍
Cache ID: 216::103