What’s Vulnerable › Vulnerabilities

CVE-2023-54034: iommufd: Make sure to zero vfio_iommu_type1_info before copying to user

• Severity: unknown
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-12-24 · updated 2026-06-17

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.

Affected products

• Linux kernel: 6.2 — fixed in 6.3

How to fix

Upgrade to a fixed version: Linux kernel 6.3. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/7adcec686e4d699c169d34c722132b2bce5232cb
• https://git.kernel.org/stable/c/b3551ead616318ea155558cdbe7e91495b8d9b33

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