Linux Kernel up to 5.15.50/5.18.7 9p v9fs_vfs_get_link reference count

Summaryinfo

A vulnerability marked as critical has been reported in Linux Kernel up to 5.15.50/5.18.7. This issue affects the function v9fs_vfs_get_link of the component 9p. This manipulation causes reference count. This vulnerability is handled as CVE-2022-49704. There is not any exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability has been found in Linux Kernel up to 5.15.50/5.18.7 and classified as critical. Affected by this vulnerability is the function v9fs_vfs_get_link of the component 9p. 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: 9p: fix fid refcount leak in v9fs_vfs_get_link we check for protocol version later than required, after a fid has been obtained. Just move the version check earlier.

The advisory is shared at git.kernel.org. This vulnerability is known as CVE-2022-49704 since 02/26/2025. Technical details are known, but no exploit is available.

Upgrading to version 5.15.51 or 5.18.8 eliminates this vulnerability. Applying the patch f0126bcaee81dabc1926012126aa74caa03a4c6e/e7b6d622bd812013eb39c8f4cd65b7ee8ede1e02/e5690f263208c5abce7451370b7786eb25b405eb 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

• 5.15.0
• 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
• 5.15.13
• 5.15.14
• 5.15.15
• 5.15.16
• 5.15.17
• 5.15.18
• 5.15.19
• 5.15.20
• 5.15.21
• 5.15.22
• 5.15.23
• 5.15.24
• 5.15.25
• 5.15.26
• 5.15.27
• 5.15.28
• 5.15.29
• 5.15.30
• 5.15.31
• 5.15.32
• 5.15.33
• 5.15.34
• 5.15.35
• 5.15.36
• 5.15.37
• 5.15.38
• 5.15.39
• 5.15.40
• 5.15.41
• 5.15.42
• 5.15.43
• 5.15.44
• 5.15.45
• 5.15.46
• 5.15.47
• 5.15.48
• 5.15.49
• 5.15.50
• 5.18.0
• 5.18.1
• 5.18.2
• 5.18.3
• 5.18.4
• 5.18.5
• 5.18.6
• 5.18.7

License

• open-source

Website

• Vendor: https://www.kernel.org/

CPE 2.3info

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CPE 2.2info

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