Linux Kernel up to 5.15/5.15.12 mount_setattr finish_mount_kattr information disclosure

Summaryinfo

A vulnerability was found in Linux Kernel up to 5.15/5.15.12. It has been classified as problematic. Impacted is the function finish_mount_kattr of the component mount_setattr. This manipulation causes information disclosure. This vulnerability is registered as CVE-2021-46923. No exploit is available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability has been found in Linux Kernel up to 5.15/5.15.12 (Operating System) and classified as problematic. Affected by this vulnerability is the function finish_mount_kattr of the component mount_setattr. The manipulation with an unknown input leads to a information disclosure vulnerability. The CWE definition for the vulnerability is CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. As an impact it is known to affect confidentiality. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: fs/mount_setattr: always cleanup mount_kattr Make sure that finish_mount_kattr() is called after mount_kattr was succesfully built in both the success and failure case to prevent leaking any references we took when we built it. We returned early if path lookup failed thereby risking to leak an additional reference we took when building mount_kattr when an idmapped mount was requested.

The weakness was published 02/27/2024. It is possible to read the advisory at git.kernel.org. This vulnerability is known as CVE-2021-46923 since 02/25/2024. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1592 according to MITRE ATT&CK.

Upgrading to version 5.15.13 or 5.16 eliminates this vulnerability. Applying the patch 47b5d0a7532d/012e332286e2 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.

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Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

Version

• 5.0
• 5.1
• 5.2
• 5.3
• 5.4
• 5.5
• 5.6
• 5.7
• 5.8
• 5.9
• 5.10
• 5.11
• 5.12
• 5.13
• 5.14
• 5.15
• 5.15.0
• 5.15.1
• 5.15.2
• 5.15.3
• 5.15.4
• 5.15.5
• 5.15.6
• 5.15.7
• 5.15.8
• 5.15.9
• 5.15.10
• 5.15.11
• 5.15.12

License

• open-source

Website

• Vendor: https://www.kernel.org/

CPE 2.3info

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CPE 2.2info

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