Linux Kernel up to 5.16.9 vt_ioctl array_index_nospec integer underflow

Summaryinfo

A vulnerability, which was classified as problematic, has been found in Linux Kernel up to 5.16.9. The affected element is the function array_index_nospec of the component vt_ioctl. Performing a manipulation results in integer underflow. This vulnerability is cataloged as CVE-2022-48804. There is no exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability classified as problematic has been found in Linux Kernel up to 5.16.9. This affects the function array_index_nospec of the component vt_ioctl. The manipulation with an unknown input leads to a integer underflow vulnerability. CWE is classifying the issue as CWE-191. The product subtracts one value from another, such that the result is less than the minimum allowable integer value, which produces a value that is not equal to the correct result. The impact remains unknown. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: vt_ioctl: fix array_index_nospec in vt_setactivate array_index_nospec ensures that an out-of-bounds value is set to zero on the transient path. Decreasing the value by one afterwards causes a transient integer underflow. vsa.console should be decreased first and then sanitized with array_index_nospec. Kasper Acknowledgements: Jakob Koschel, Brian Johannesmeyer, Kaveh Razavi, Herbert Bos, Cristiano Giuffrida from the VUSec group at VU Amsterdam.

The advisory is shared at git.kernel.org. This vulnerability is uniquely identified as CVE-2022-48804 since 07/16/2024. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 09/29/2024).

The vulnerability scanner Nessus provides a plugin with the ID 207773 (Oracle Linux 8 : kernel (ELSA-2024-7000)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 4.9.302, 4.14.267, 4.19.230, 5.4.180, 5.10.101, 5.15.24 or 5.16.10 eliminates this vulnerability. Applying the patch 830c5aa302ec/2a45a6bd1e6d/170325aba460/ae3d57411562/778302ca0949/ffe54289b02e/6550bdf52846/61cc70d9e8ef 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 (207773). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

Version

• 4.9.301
• 4.14.266
• 4.19.229
• 5.0
• 5.1
• 5.2
• 5.3
• 5.4
• 5.4.179
• 5.5
• 5.6
• 5.7
• 5.8
• 5.9
• 5.10.100
• 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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If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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