CVE-2026-46103
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UCAN Control Message Buffer Lifetime Issue in Linux Kernel

Publication date: 2026-05-27

Last updated on: 2026-06-01

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: can: ucan: fix devres lifetime USB drivers bind to USB interfaces and any device managed resources should have their lifetime tied to the interface rather than parent USB device. This avoids issues like memory leaks when drivers are unbound without their devices being physically disconnected (e.g. on probe deferral or configuration changes). Fix the control message buffer lifetime so that it is released on driver unbind.
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Meta Information
Published
2026-05-27
Last Modified
2026-06-01
Generated
2026-06-16
AI Q&A
2026-05-27
EPSS Evaluated
2026-06-15
NVD
CVE-2026-46103
EUVD
EUVD-2026-32486
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
linux linux_kernel *
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Exploitability
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CWE ID Description
CWE-UNKNOWN
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Executive Summary

This vulnerability relates to the Linux kernel's USB drivers, specifically the 'can: ucan' component. The issue was that device-managed resources were tied to the parent USB device instead of the USB interface. This caused problems such as memory leaks when drivers were unbound without the physical disconnection of their devices, for example during probe deferral or configuration changes.

The fix involved correcting the lifetime management of the control message buffer so that it is properly released when the driver is unbound, preventing resource leaks.

Impact Analysis

This vulnerability can lead to memory leaks in the Linux kernel when USB drivers are unbound without the device being physically disconnected. Over time, such leaks could degrade system performance or stability, potentially causing resource exhaustion or unexpected behavior in systems relying on USB devices.

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