VDB-327704 · CVE-2025-39954 · Nessus 270272

Linux Kernel up to 6.16.8 clk recalc_rate divide by zero

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5.5	$0-$5k	0.00

Summaryinfo

A vulnerability was found in Linux Kernel up to 6.16.8. It has been declared as critical. This vulnerability affects the function recalc_rate of the component clk. Such manipulation leads to divide by zero. This vulnerability is traded as CVE-2025-39954. There is no exploit available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.16.8 and classified as critical. Affected by this issue is the function recalc_rate of the component clk. The manipulation with an unknown input leads to a divide by zero vulnerability. Using CWE to declare the problem leads to CWE-369. The product divides a value by zero. Impacted is availability. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: clk: sunxi-ng: mp: Fix dual-divider clock rate readback When dual-divider clock support was introduced, the P divider offset was left out of the .recalc_rate readback function. This causes the clock rate to become bogus or even zero (possibly due to the P divider being 1, leading to a divide-by-zero). Fix this by incorporating the P divider offset into the calculation.

The advisory is shared for download at git.kernel.org. This vulnerability is handled as CVE-2025-39954 since 04/16/2025. There are known technical details, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 270272 (Linux Distros Unpatched Vulnerability : CVE-2025-39954), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 6.16.9 eliminates this vulnerability. Applying the patch 40108f69c372af3aea73e7829d6849a44638d662/25fbbaf515acd13399589bd5ee6de5f35740cef2 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 (270272) and CERT Bund (WID-SEC-2025-2246). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Affected

Debian Linux
Amazon Linux 2
Red Hat Enterprise Linux
Ubuntu Linux
SUSE Linux
Oracle Linux
SUSE openSUSE
RESF Rocky Linux
Open Source Linux Kernel
IBM QRadar SIEM

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: Divide by zero
CWE: CWE-369 / CWE-404
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
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Nessus ID: 270272
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2025-39954

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 6.16.9
Patch: 40108f69c372af3aea73e7829d6849a44638d662/25fbbaf515acd13399589bd5ee6de5f35740cef2

Timelineinfo

04/16/2025 CVE reserved
10/09/2025 +176 days Advisory disclosed
10/09/2025 +0 days VulDB entry created
02/13/2026 +127 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2025-39954 (🔒)
GCVE (CVE): GCVE-0-2025-39954
GCVE (VulDB): GCVE-100-327704
CERT Bund: WID-SEC-2025-2246 - Linux Kernel: Mehrere Schwachstellen

Entryinfo

Created: 10/09/2025 12:48
Updated: 02/13/2026 03:21
Changes: 10/09/2025 12:48 (59), 10/09/2025 13:35 (7), 10/19/2025 05:33 (2), 11/21/2025 04:51 (1), 11/25/2025 11:04 (1), 11/30/2025 14:18 (1), 12/22/2025 04:02 (1), 02/03/2026 18:00 (10), 02/13/2026 03:21 (1)
Complete: 🔍
Cache ID: 216::103

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