CVE-2025-68734
Unknown Unknown - Not Provided

Memory Leak in Linux Kernel mISDN hfcsusb_probe() Fixed

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: isdn: mISDN: hfcsusb: fix memory leak in hfcsusb_probe() In hfcsusb_probe(), the memory allocated for ctrl_urb gets leaked when setup_instance() fails with an error code. Fix that by freeing the urb before freeing the hw structure. Also change the error paths to use the goto ladder style. Compile tested only. Issue found using a prototype static analysis tool.

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Meta Information

Published
2025-12-24
Last Modified
2025-12-24
Generated
2026-07-06
AI Q&A
2025-12-24
EPSS Evaluated
2026-07-05
NVD
CVE-2025-68734
EUVD
EUVD-2025-205111

Affected Vendors & Products

Showing 2 associated CPEs
Vendor Product Version / Range
linux kernel *
misdn hfcsusb *

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-UNKNOWN

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Mitigation Strategies

Apply the patch or update to the fixed version of the Linux kernel that resolves the memory leak in hfcsusb_probe() by properly freeing the allocated memory. Since this issue was identified and fixed in the kernel source, updating to the latest kernel version containing this fix is the recommended mitigation.

Executive Summary

This vulnerability is a memory leak in the Linux kernel's hfcsusb driver within the mISDN subsystem. Specifically, in the hfcsusb_probe() function, memory allocated for ctrl_urb is not freed if setup_instance() fails, leading to a memory leak. The fix involves freeing the allocated memory properly before freeing the hardware structure and restructuring error handling.

Impact Analysis

The memory leak can cause increased memory usage over time, potentially leading to reduced system performance or stability issues if the leaked memory accumulates, especially on systems using the affected driver.

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