Linux Kernel up to 6.12.63/6.18.2/6.19-rc1 nf_conncount reference count

CVSS Meta Temp Score
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CTI Interest Score
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5.5$0-$5k0.00

Summaryinfo

A vulnerability marked as critical has been reported in Linux Kernel up to 6.12.63/6.18.2/6.19-rc1. This impacts an unknown function of the component nf_conncount. Performing a manipulation results in reference count. This vulnerability is cataloged as CVE-2025-71146. There is no exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability classified as critical has been found in Linux Kernel up to 6.12.63/6.18.2/6.19-rc1. This affects an unknown code of the component nf_conncount. The manipulation with an unknown input leads to a reference count vulnerability. CWE is classifying the issue as CWE-911. The product uses a reference count to manage a resource, but it does not update or incorrectly updates the reference count. This is going to have an impact on availability. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_conncount: fix leaked ct in error paths There are some situations where ct might be leaked as error paths are skipping the refcounted check and return immediately. In order to solve it make sure that the check is always called.

The advisory is shared at git.kernel.org. This vulnerability is uniquely identified as CVE-2025-71146 since 01/13/2026. Neither technical details nor an exploit are publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 296389 (Linux Distros Unpatched Vulnerability : CVE-2025-71146), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 6.12.64, 6.18.3, 6.19-rc1 or 6.19-rc2 eliminates this vulnerability. Applying the patch 08fa37f4c8c59c294e9c18fea2d083ee94074e5a/e1ac8dce3a893641bef224ad057932f142b8a36f/f381a33f34dda9e4023e38ba68c943bca83245e9/325eb61bb30790ea27782203a17b007ce1754a67/0b88be7211d21a0d68bb1e56dc805944e3654d6f/4bd2b89f4028f250dd1c1625eb3da1979b04a5e8/2e2a720766886190a6d35c116794693aabd332b6 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 (296389) and CERT Bund (WID-SEC-2026-0215). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Affected

  • Debian Linux
  • Amazon Linux 2
  • Red Hat Enterprise Linux
  • Ubuntu Linux
  • SUSE Linux
  • Oracle Linux
  • IBM QRadar SIEM
  • SUSE openSUSE
  • RESF Rocky Linux
  • NetApp ActiveIQ Unified Manager
  • Open Source Linux Kernel

Productinfo

Type

Vendor

Name

Version

License

Website

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

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

Exploitinginfo

Class: Reference count
CWE: CWE-911 / CWE-664
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: 296389
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2025-71146

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 6.12.64/6.18.3/6.19-rc1/6.19-rc2
Patch: 08fa37f4c8c59c294e9c18fea2d083ee94074e5a/e1ac8dce3a893641bef224ad057932f142b8a36f/f381a33f34dda9e4023e38ba68c943bca83245e9/325eb61bb30790ea27782203a17b007ce1754a67/0b88be7211d21a0d68bb1e56dc805944e3654d6f/4bd2b89f4028f250dd1c1625eb3da1979b04a5e8/2e2a720766886190a6d35c116794693aabd332b6

Timelineinfo

01/13/2026 CVE reserved
01/23/2026 +10 days Advisory disclosed
01/23/2026 +0 days VulDB entry created
05/17/2026 +114 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2025-71146 (🔒)
GCVE (CVE): GCVE-0-2025-71146
GCVE (VulDB): GCVE-100-342549
CERT Bund: WID-SEC-2026-0215 - Linux Kernel: Mehrere Schwachstellen

Entryinfo

Created: 01/23/2026 16:16
Updated: 05/17/2026 19:37
Changes: 01/23/2026 16:16 (58), 01/25/2026 12:46 (2), 01/26/2026 13:22 (7), 02/26/2026 23:51 (10), 03/02/2026 09:54 (1), 05/17/2026 19:37 (1)
Complete: 🔍
Cache ID: 216::103

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