Linux Kernel up to 6.0.7 pmem remove memory leak

Summaryinfo

A vulnerability described as critical has been identified in Linux Kernel up to 6.0.7. This impacts the function remove of the component pmem. The manipulation results in memory leak. This vulnerability is cataloged as CVE-2022-49896. There is no exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability, which was classified as critical, was found in Linux Kernel up to 6.0.7. Affected is the function remove of the component pmem. The manipulation with an unknown input leads to a memory leak vulnerability. CWE is classifying the issue as CWE-401. The product does not sufficiently track and release allocated memory after it has been used, which slowly consumes remaining memory. This is going to have an impact on availability. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: cxl/pmem: Fix cxl_pmem_region and cxl_memdev leak When a cxl_nvdimm object goes through a ->remove() event (device physically removed, nvdimm-bridge disabled, or nvdimm device disabled), then any associated regions must also be disabled. As highlighted by the cxl-create-region.sh test [1], a single device may host multiple regions, but the driver was only tracking one region at a time. This leads to a situation where only the last enabled region per nvdimm device is cleaned up properly. Other regions are leaked, and this also causes cxl_memdev reference leaks. Fix the tracking by allowing cxl_nvdimm objects to track multiple region associations.

The advisory is available at git.kernel.org. This vulnerability is traded as CVE-2022-49896 since 05/01/2025. Technical details are known, but there is no available exploit.

The vulnerability scanner Nessus provides a plugin with the ID 246860 (Linux Distros Unpatched Vulnerability : CVE-2022-49896), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 6.0.8 eliminates this vulnerability. Applying the patch f43b6bfdbab78606735ba81185cf0602b81e40b6/4d07ae22e79ebc2d7528bbc69daa53b86981cb3a 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 vulnerability database at Tenable (246860). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

Version

• 6.0.0
• 6.0.1
• 6.0.2
• 6.0.3
• 6.0.4
• 6.0.5
• 6.0.6
• 6.0.7

License

• open-source

Website

• Vendor: https://www.kernel.org/

CPE 2.3info

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If you want to get best quality of vulnerability data, you may have to visit VulDB.

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