Vulnerability in iommu/vt-d: Fix sysfs leak in alloc_iommu()

Kernel Updated 02 Oct 2025

Summary

04/06/2021

Disclosed on

N/A

Severity

No i

Fix available

Unrated

Severity

Not published

CVSS Score

UVI-2021-1000683: iommu/vt-d: Fix sysfs leak in alloc_iommu(). Affects Kernel versions >= 39ab9555c24110671f8dc671311a26e5c985b592, < 22da9f4978381a99f1abaeaf6c9b83be6ab5ddd8. No fix is published. How to fix ↓

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Background

The iommu/vt-d package is a component of the Linux Kernel that provides support for Input-Output Memory Management Units (IOMMU) and Intel Virtualization Technology for Directed I/O (VT-d). It enables secure and efficient device access by mapping device memory to virtual addresses. This vulnerability affects versions of the Linux Kernel from v4.11 to v4.14.234, and it was fixed in v4.14.235. The vulnerability allows for a sysfs leak in the alloc_iommu() function.

Vulnerability Detail

The vulnerability in the iommu/vt-d package arises from a sysfs leak in the alloc_iommu() function. This leak can potentially be exploited by an attacker to gain unauthorized access or perform other malicious activities. The impact and attack plausibility of this vulnerability have not been proven yet. The vulnerability was introduced in version v4.11 of the Linux Kernel by commit 39ab9555c24110671f8dc671311a26e5c985b592 and was fixed in version v4.14.235 by commit 22da9f4978381a99f1abaeaf6c9b83be6ab5ddd8.

How To Fix

No fixed version is published for this vulnerability.

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Workaround

There is no specific workaround mentioned for this vulnerability.

Conclusion

The vulnerability in the iommu/vt-d package has been identified and fixed in the Linux Kernel version v4.14.235. It is recommended to update to this version or later to mitigate the risk. For further support on vulnerability remediation, please contact DevNack.com.

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