CVE-2026-43432

In the Linux kernel, the following vulnerability has been resolved:

usb: xhci: Fix memory leak in xhci_disable_slot()

xhci_alloc_command() allocates a command structure and, when the

second argument is true, also allocates a completion structure.

Currently, the error handling path in xhci_disable_slot() only frees

the command structure using kfree(), causing the completion structure

to leak.

Use xhci_free_command() instead of kfree(). xhci_free_command() correctly

frees both the command structure and the associated completion structure.

Since the command structure is allocated with zero-initialization,

command->in_ctx is NULL and will not be erroneously freed by

xhci_free_command().

This bug was found using an experimental static analysis tool we are

developing. The tool is based on the LLVM framework and is specifically

designed to detect memory management issues. It is currently under

active development and not yet publicly available, but we plan to

open-source it after our research is published.

The bug was originally detected on v6.13-rc1 using our static analysis

tool, and we have verified that the issue persists in the latest mainline

kernel.

We performed build testing on x86_64 with allyesconfig using GCC=11.4.0.

Since triggering these error paths in xhci_disable_slot() requires specific

hardware conditions or abnormal state, we were unable to construct a test

case to reliably trigger these specific error paths at runtime.