Vulnerability in udmabuf package: validate ubuf->pagecount

Kernel Updated 02 Oct 2025

Summary

24/04/2022

Disclosed on

N/A

Severity

No i

Fix available

Unrated

Severity

Not published

CVSS Score

GSD-2022-1001867: udmabuf: validate ubuf->pagecount. Affects Kernel versions >= fbb0de795078190a9834b3409e4b009cfb18a6d4, < 811b667cefbea9cb7511a874b169d6a92907137e. No fix is published. How to fix ↓

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Background

The udmabuf package is a component of the Linux Kernel ecosystem. It provides a mechanism for userspace applications to allocate and share contiguous memory buffers with DMA capabilities. These buffers are commonly used in scenarios where direct memory access is required, such as in multimedia applications or device drivers. However, a vulnerability has been discovered in the udmabuf package that could potentially be exploited by attackers.

Vulnerability Detail

The vulnerability in the udmabuf package lies in the validation of the 'ubuf->pagecount' parameter. This parameter represents the number of pages allocated for the buffer. Insufficient validation of this parameter could lead to various security issues, including buffer overflows, memory corruption, and privilege escalation. Attackers may be able to manipulate the 'ubuf->pagecount' value to access sensitive information, execute arbitrary code, or disrupt the system's stability. This vulnerability was introduced in version v4.20 of the Linux Kernel and has been fixed in version v5.15.33.

How To Fix

No fixed version is published for this vulnerability.

To fix this vulnerability, it is recommended to update the Linux Kernel to version v5.15.33 or later. This update includes the necessary patch to validate the 'ubuf->pagecount' parameter properly. Users can obtain the updated kernel from the official Linux Kernel repository: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/

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Workaround

No specific workaround has been provided for this vulnerability. It is advised to apply the fix mentioned above by updating the Linux Kernel to the recommended version.

Conclusion

The udmabuf package in the Linux Kernel is vulnerable to a validation issue in the 'ubuf->pagecount' parameter. This vulnerability can have severe consequences, including arbitrary code execution and information disclosure. It is crucial to update the Linux Kernel to version v5.15.33 or later to mitigate this vulnerability. For further support on vulnerability remediation, please contact DevNack.com.

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