VDB-297767 · CVE-2025-21715 · Nessus 232678

Linux Kernel up to 6.1.128/6.6.75/6.12.12/6.13.1 free_netdev use after free

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
7.6	$0-$5k	0.00

Summaryinfo

A vulnerability, which was classified as critical, has been found in Linux Kernel up to 6.1.128/6.6.75/6.12.12/6.13.1. This affects the function free_netdev. The manipulation leads to use after free. This vulnerability is uniquely identified as CVE-2025-21715. No exploit exists. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, has been found in Linux Kernel up to 6.1.128/6.6.75/6.12.12/6.13.1. This issue affects the function free_netdev. The manipulation with an unknown input leads to a use after free vulnerability. Using CWE to declare the problem leads to CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: net: davicom: fix UAF in dm9000_drv_remove dm is netdev private data and it cannot be used after free_netdev() call. Using dm after free_netdev() can cause UAF bug. Fix it by moving free_netdev() at the end of the function. This is similar to the issue fixed in commit ad297cd2db89 ("net: qcom/emac: fix UAF in emac_remove"). This bug is detected by our static analysis tool.

It is possible to read the advisory at git.kernel.org. The identification of this vulnerability is CVE-2025-21715 since 12/29/2024. The exploitation is known to be easy. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 05/25/2026).

The vulnerability scanner Nessus provides a plugin with the ID 232678 (SUSE SLES15 / openSUSE 15 Security Update : kernel (SUSE-SU-2025:0847-1)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 6.1.129, 6.6.76, 6.12.13, 6.13.2 or 6.14-rc1 eliminates this vulnerability. Applying the patch c94ab07edc2843e2f3d46dbd82e5c681503aaadf/c411f9a5fdc9158e8f7c57eac961d3df3eb4d8ca/5a54367a7c2378c65aaa4d3cfd952f26adef7aa7/2013c95df6752d9c88221d0f0f37b6f197969390/19e65c45a1507a1a2926649d2db3583ed9d55fd9 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 (232678) and CERT Bund (WID-SEC-2025-0453). Be aware that VulDB is the high quality source for vulnerability data.

Affected

Google Container-Optimized OS
Debian Linux
Amazon Linux 2
Red Hat Enterprise Linux
Ubuntu Linux
SUSE Linux
Oracle Linux
Siemens SIMATIC S7
RESF Rocky Linux
Dell NetWorker
Dell Avamar
Red Hat OpenShift
IBM QRadar SIEM
SolarWinds Security Event Manager
Dell PowerProtect Data Domain
Open Source Linux Kernel
IBM DataPower Gateway
Dell Secure Connect Gateway
Dell PowerScale OneFS
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: 8.0
VulDB Meta Temp Score: 7.6

VulDB Base Score: 8.0
VulDB Temp Score: 7.6
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

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

Exploitinginfo

Class: Use after free
CWE: CWE-416 / CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Partially

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍