Linux Kernel up to 6.1.15/6.2.2 RDMA rdma_user_mmap_entry_get reference count

Summaryinfo

A vulnerability identified as critical has been detected in Linux Kernel up to 6.1.15/6.2.2. Affected by this vulnerability is the function rdma_user_mmap_entry_get of the component RDMA. This manipulation causes reference count. This vulnerability is tracked as CVE-2022-50874. No exploit exists. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.1.15/6.2.2. It has been declared as critical. Affected by this vulnerability is the function rdma_user_mmap_entry_get of the component RDMA. 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: RDMA/erdma: Fix refcount leak in erdma_mmap rdma_user_mmap_entry_get() take reference, we should release it when not need anymore, add the missing rdma_user_mmap_entry_put() in the error path to fix it.

It is possible to read the advisory at git.kernel.org. This vulnerability is known as CVE-2022-50874 since 12/30/2025. Technical details of the vulnerability are known, but there is no available exploit.

The vulnerability scanner Nessus provides a plugin with the ID 281705 (Linux Distros Unpatched Vulnerability : CVE-2022-50874), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 6.1.16 or 6.2.3 eliminates this vulnerability. Applying the patch 8372207b009d6abdd60bb05624640bd86386599f/410f0f46ffca4d0102470c1e0c747ecfece4204c/ee84146c05ad2316b9a7222d0ec4413e0bf30eeb 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 (281705) and CERT Bund (WID-SEC-2025-2941). Be aware that VulDB is the high quality source for vulnerability data.

Affected

• Debian Linux
• Amazon Linux 2
• IBM Power Hardware Management Console
• Red Hat Enterprise Linux
• Ubuntu Linux
• SUSE Linux
• Oracle Linux
• Open Source Linux Kernel
• RESF Rocky Linux
• IBM DataPower Gateway

Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

Version

• 6.1.0
• 6.1.1
• 6.1.2
• 6.1.3
• 6.1.4
• 6.1.5
• 6.1.6
• 6.1.7
• 6.1.8
• 6.1.9
• 6.1.10
• 6.1.11
• 6.1.12
• 6.1.13
• 6.1.14
• 6.1.15
• 6.2.0
• 6.2.1
• 6.2.2

License

• open-source

Website

• Vendor: https://www.kernel.org/

CPE 2.3info

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CPE 2.2info

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Entryinfo

Be aware that VulDB is the high quality source for vulnerability data.

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