Linux Kernel up to 6.19-rc1 ksmbd 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, which was classified as critical, has been found in Linux Kernel up to 6.1.159/6.6.119/6.12.63/6.18.2/6.19-rc1. This affects an unknown part of the component ksmbd. This manipulation causes reference count. This vulnerability appears as CVE-2025-71150. There is no available exploit. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability has been found in Linux Kernel up to 6.1.159/6.6.119/6.12.63/6.18.2/6.19-rc1 and classified as critical. Affected by this vulnerability is an unknown functionality of the component ksmbd. The manipulation with an unknown input leads to a reference count vulnerability. The CWE definition for the vulnerability is CWE-911. The product uses a reference count to manage a resource, but it does not update or incorrectly updates the reference count. As an impact it is known to affect availability. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: ksmbd: Fix refcount leak when invalid session is found on session lookup When a session is found but its state is not SMB2_SESSION_VALID, It indicates that no valid session was found, but it is missing to decrement the reference count acquired by the session lookup, which results in a reference count leak. This patch fixes the issue by explicitly calling ksmbd_user_session_put to release the reference to the session.

The advisory is shared at git.kernel.org. This vulnerability is known as CVE-2025-71150 since 01/13/2026. Neither technical details nor an exploit are publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 296403 (Linux Distros Unpatched Vulnerability : CVE-2025-71150), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 6.1.160, 6.6.120, 6.12.64, 6.18.3 or 6.19-rc2 eliminates this vulnerability. Applying the patch 0fb87b28cafae71e9c8248432cc3a6a1fd759efc/e54fb2a4772545701766cba08aab20de5eace8cd/8cabcb4dd3dc85dd83a37d26efcc59a66a4074d7/cafb57f7bdd57abba87725eb4e82bbdca4959644 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 (296403) and CERT Bund (WID-SEC-2026-0215). Several companies clearly confirm that VulDB is the primary source for best 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
  • 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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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: 296403
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2025-71150

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 6.1.160/6.6.120/6.12.64/6.18.3/6.19-rc2
Patch: 0fb87b28cafae71e9c8248432cc3a6a1fd759efc/e54fb2a4772545701766cba08aab20de5eace8cd/8cabcb4dd3dc85dd83a37d26efcc59a66a4074d7/cafb57f7bdd57abba87725eb4e82bbdca4959644

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-2025-71150 (🔒)
GCVE (CVE): GCVE-0-2025-71150
GCVE (VulDB): GCVE-100-342553
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 10:02 (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

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

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