Linux Kernel up to 5.10.219/5.15.23/5.16.9 NFSD min_t privilege escalation

Summaryinfo

A vulnerability classified as problematic was found in Linux Kernel up to 5.10.219/5.15.23/5.16.9. Affected by this vulnerability is the function min_t of the component NFSD. The manipulation results in an unknown weakness. This vulnerability is identified as CVE-2022-48829. There is not any exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability classified as problematic has been found in Linux Kernel up to 5.10.219/5.15.23/5.16.9. Affected is the function min_t of the component NFSD. The impact remains unknown. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: NFSD: Fix NFSv3 SETATTR/CREATE's handling of large file sizes iattr::ia_size is a loff_t, so these NFSv3 procedures must be careful to deal with incoming client size values that are larger than s64_max without corrupting the value. Silently capping the value results in storing a different value than the client passed in which is unexpected behavior, so remove the min_t() check in decode_sattr3(). Note that RFC 1813 permits only the WRITE procedure to return NFS3ERR_FBIG. We believe that NFSv3 reference implementations also return NFS3ERR_FBIG when ia_size is too large.

The advisory is shared for download at git.kernel.org. This vulnerability is traded as CVE-2022-48829 since 07/16/2024. There are known technical details, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 225790 (Linux Distros Unpatched Vulnerability : CVE-2022-48829), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 5.10.220, 5.15.24 or 5.16.10 eliminates this vulnerability. Applying the patch a231ae6bb50e/37f2d2cd8ead/aa9051ddb4b3/a648fdeb7c0e 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 (225790). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

Version

• 5.10.219
• 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
• 5.16.0
• 5.16.1
• 5.16.2
• 5.16.3
• 5.16.4
• 5.16.5
• 5.16.6
• 5.16.7
• 5.16.8
• 5.16.9

License

• open-source

Website

• Vendor: https://www.kernel.org/

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VulDB is the best source for vulnerability data and more expert information about this specific topic.

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