VDB-322897 · CVE-2025-39687 · Nessus 261628

Linux Kernel up to 6.17-rc2 iio buffer overflow

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.
7.4	$0-$5k	0.00

Summaryinfo

A vulnerability, which was classified as critical, has been found in Linux Kernel up to 6.17-rc2. This vulnerability affects unknown code of the component iio. This manipulation causes buffer overflow. This vulnerability is tracked as CVE-2025-39687. No exploit exists. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability has been found in Linux Kernel up to 6.17-rc2 and classified as critical. Affected by this vulnerability is an unknown functionality of the component iio. The manipulation with an unknown input leads to a buffer overflow vulnerability. The CWE definition for the vulnerability is CWE-120. The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: iio: light: as73211: Ensure buffer holes are zeroed Given that the buffer is copied to a kfifo that ultimately user space can read, ensure we zero it.

The advisory is shared at git.kernel.org. This vulnerability is known as CVE-2025-39687 since 04/16/2025. The exploitation appears to be easy. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 02/09/2026).

The vulnerability scanner Nessus provides a plugin with the ID 261628 (Linux Distros Unpatched Vulnerability : CVE-2025-39687), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 5.10.241, 5.15.190, 6.1.149, 6.6.103, 6.12.44, 6.16.4 or 6.17-rc3 eliminates this vulnerability. Applying the patch fd441fd972067f80861a0b66605c0febb0d038dd/d8c5d87a431596e0e02bd7fe3bff952b002a03bb/83f14c4ca1ad78fcfb3e0de07d6d8a0c59550fc2/99b508340d0d1b9de0856c48c77898b14c0df7cf/cce55ca4e7a221d5eb2c0b757a868eacd6344e4a/8acd9a0eaa8c9a28e385c0a6a56bb821cb549771/433b99e922943efdfd62b9a8e3ad1604838181f2 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 (261628) and CERT Bund (WID-SEC-2025-1988). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Affected

Debian Linux
Google Cloud Platform
Amazon Linux 2
Red Hat Enterprise Linux
Ubuntu Linux
SUSE Linux
Oracle Linux
NetApp FAS
NetApp AFF
NetApp ActiveIQ Unified Manager
SUSE openSUSE
RESF Rocky Linux
Open Source Linux Kernel
Microsoft Azure
Dell Secure Connect Gateway
IBM QRadar SIEM
IBM Security Verify Access
Dell NetWorker

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: 7.6
VulDB Meta Temp Score: 7.4

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

NVD Base Score: 7.1
NVD Vector: 🔒

CVSSv2info

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

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Buffer overflow
CWE: CWE-120 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: Partially

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Nessus ID: 261628
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2025-39687

Threat Intelligenceinfo

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

Countermeasuresinfo

Timelineinfo

04/16/2025 CVE reserved
09/05/2025 +142 days Advisory disclosed
09/05/2025 +0 days VulDB entry created
02/09/2026 +157 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2025-39687 (🔒)
GCVE (CVE): GCVE-0-2025-39687
GCVE (VulDB): GCVE-100-322897
CERT Bund: WID-SEC-2025-1988 - Linux Kernel: Mehrere Schwachstellen ermöglichen Denial of Service

Entryinfo

Created: 09/05/2025 21:45
Updated: 02/09/2026 16:44
Changes: 09/05/2025 21:45 (58), 09/07/2025 05:44 (2), 11/06/2025 17:47 (7), 11/27/2025 16:56 (1), 01/03/2026 13:14 (1), 01/05/2026 12:08 (1), 01/27/2026 18:02 (11), 02/09/2026 16:44 (1)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.