CVE-2023-54034
Unknown Unknown - Not Provided

Uninitialized Memory in Linux iommufd Risks Information Disclosure

Publication date: 2025-12-24

Last updated on: 2025-12-24

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: iommufd: Make sure to zero vfio_iommu_type1_info before copying to user Missed a zero initialization here. Most of the struct is filled with a copy_from_user(), however minsz for that copy is smaller than the actual struct by 8 bytes, thus we don't fill the padding.

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Meta Information

Published
2025-12-24
Last Modified
2025-12-24
Generated
2026-07-07
AI Q&A
2025-12-24
EPSS Evaluated
2026-07-05
NVD
CVE-2023-54034
EUVD
EUVD-2025-205137

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
linux linux_kernel *

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Exploitability

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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This vulnerability in the Linux kernel involves the iommufd component where a structure (vfio_iommu_type1_info) was not fully zero-initialized before being copied to user space. Specifically, the copy_from_user() function copies less data than the size of the structure by 8 bytes, leaving some padding uninitialized. This missed zero initialization could potentially lead to unintended data being exposed or used.

Impact Analysis

Because part of the structure is not properly zeroed before being copied to user space, there is a risk that uninitialized memory (potentially containing sensitive or arbitrary data) could be exposed to user applications. This could lead to information leakage or unpredictable behavior in applications relying on this data.

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