---
id: CVE-2026-43432
title: 'usb: xhci: Fix memory leak in xhci_disable_slot()'
summary: |-
  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…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= fee8be5bde562d4f5f9a100ca80c6d7072ed34c8 <
    1e800e26d54ccf2ddf2ea6d6cbe021c804d8aa62
  - >-
    Linux >= 02d5a2a48bb44e7404b794df87e57588b2fd604e <
    6288baf0c8c4dcfbf206773aede9c1f2269cec28
  - >-
    Linux >= 7faac1953ed1f658f719cdf7bb7303fa5eef822c <
    46aea90763832cd6e9b0c2e1c00e6a9512156d4b
  - >-
    Linux >= 7faac1953ed1f658f719cdf7bb7303fa5eef822c <
    2e2baa8fb5aa4d080cbfeb84c51eff797529f413
  - >-
    Linux >= 7faac1953ed1f658f719cdf7bb7303fa5eef822c <
    807e4fb5140c73eb5dba1e399a990db5c1f3cdf8
  - >-
    Linux >= 7faac1953ed1f658f719cdf7bb7303fa5eef822c <
    c65f1b840ab8ce72ba68f1b63bab7960f8fdfa89
  - >-
    Linux >= 7faac1953ed1f658f719cdf7bb7303fa5eef822c <
    078b446efc0f5e496c31bccb72b98af979963a83
  - >-
    Linux >= 7faac1953ed1f658f719cdf7bb7303fa5eef822c <
    c1c8550e70401159184130a1afc6261db01fc0ce
  - Linux cc7c2818c71ebace207df40cc586c8c74e3d1a59
  - Linux ec0cddcc2454ab08193beb473978f8f8889b7e24
  - Linux >= 5.10.85 < 5.10.253
  - Linux >= 5.15.8 < 5.15.203
  - Linux >= 4.19.221 < 4.20
  - Linux >= 5.4.165 < 5.5
  - Linux 5.16
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-06T15:38:24.180135Z'
published: '2026-05-08'
updated: '2026-11-06'
sourceUpdated: '2026-11-06T15:42:53.707Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-43432'
references:
  - url: 'https://git.kernel.org/stable/c/1e800e26d54ccf2ddf2ea6d6cbe021c804d8aa62'
  - url: 'https://git.kernel.org/stable/c/6288baf0c8c4dcfbf206773aede9c1f2269cec28'
  - url: 'https://git.kernel.org/stable/c/46aea90763832cd6e9b0c2e1c00e6a9512156d4b'
  - url: 'https://git.kernel.org/stable/c/2e2baa8fb5aa4d080cbfeb84c51eff797529f413'
  - url: 'https://git.kernel.org/stable/c/807e4fb5140c73eb5dba1e399a990db5c1f3cdf8'
  - url: 'https://git.kernel.org/stable/c/c65f1b840ab8ce72ba68f1b63bab7960f8fdfa89'
  - url: 'https://git.kernel.org/stable/c/078b446efc0f5e496c31bccb72b98af979963a83'
  - url: 'https://git.kernel.org/stable/c/c1c8550e70401159184130a1afc6261db01fc0ce'
tags:
  - cve.org
epss: 0.00123
epssPercentile: 0.02025
ingestedAt: '2026-11-06T15:54:03.912Z'
---

## Overview

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.

## Affected

- `Linux >= fee8be5bde562d4f5f9a100ca80c6d7072ed34c8 < 1e800e26d54ccf2ddf2ea6d6cbe021c804d8aa62`
- `Linux >= 02d5a2a48bb44e7404b794df87e57588b2fd604e < 6288baf0c8c4dcfbf206773aede9c1f2269cec28`
- `Linux >= 7faac1953ed1f658f719cdf7bb7303fa5eef822c < 46aea90763832cd6e9b0c2e1c00e6a9512156d4b`
- `Linux >= 7faac1953ed1f658f719cdf7bb7303fa5eef822c < 2e2baa8fb5aa4d080cbfeb84c51eff797529f413`
- `Linux >= 7faac1953ed1f658f719cdf7bb7303fa5eef822c < 807e4fb5140c73eb5dba1e399a990db5c1f3cdf8`
- `Linux >= 7faac1953ed1f658f719cdf7bb7303fa5eef822c < c65f1b840ab8ce72ba68f1b63bab7960f8fdfa89`
- `Linux >= 7faac1953ed1f658f719cdf7bb7303fa5eef822c < 078b446efc0f5e496c31bccb72b98af979963a83`
- `Linux >= 7faac1953ed1f658f719cdf7bb7303fa5eef822c < c1c8550e70401159184130a1afc6261db01fc0ce`
- `Linux cc7c2818c71ebace207df40cc586c8c74e3d1a59`
- `Linux ec0cddcc2454ab08193beb473978f8f8889b7e24`
- `Linux >= 5.10.85 < 5.10.253`
- `Linux >= 5.15.8 < 5.15.203`
- `Linux >= 4.19.221 < 4.20`
- `Linux >= 5.4.165 < 5.5`
- `Linux 5.16`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.