CVE-2022-50767
Unknown Unknown - Not Provided

Use-After-Free Vulnerabilities in Linux fbdev smscufx on USB Removal

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: fbdev: smscufx: Fix several use-after-free bugs Several types of UAFs can occur when physically removing a USB device. Adds ufx_ops_destroy() function to .fb_destroy of fb_ops, and in this function, there is kref_put() that finally calls ufx_free(). This fix prevents multiple UAFs.

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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
2026-07-06
NVD
CVE-2022-50767

Affected Vendors & Products

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

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Exploitability

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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This vulnerability involves several use-after-free (UAF) bugs in the Linux kernel's fbdev smscufx driver. These UAF bugs can occur when physically removing a USB device. The issue was fixed by adding a ufx_ops_destroy() function to the .fb_destroy of fb_ops, which includes a kref_put() call that eventually calls ufx_free(), preventing multiple use-after-free conditions.

Impact Analysis

The use-after-free bugs could potentially lead to system instability, crashes, or exploitation by attackers to execute arbitrary code or escalate privileges when a USB device is physically removed. This could compromise system security and reliability.

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