---
id: CVE-2026-80572
title: 'Input: byd - synchronize timer deletion before freeing private data'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  Input: byd - synchronize timer deletion before freeing private data

  byd_disconnect() uses timer_delete() before freeing the driver's private
  data.  This does not wait …
severity: high
cvss: 7.8
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
cvssSource: cna
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 2d5f5611dd0de52e9a52b56391a7049a52184e72 <
    84b205297fa15f97510342221d8c9a0119711478
  - >-
    Linux >= 2d5f5611dd0de52e9a52b56391a7049a52184e72 <
    28d984a66b9e14be74986167b6ad40b5e0daf19a
  - >-
    Linux >= 2d5f5611dd0de52e9a52b56391a7049a52184e72 <
    ee944a706a18322b4a2599eebe8040a2994e928f
  - >-
    Linux >= 2d5f5611dd0de52e9a52b56391a7049a52184e72 <
    8dbfd8e32a13e116790780ed0be82b5a05eb9916
  - >-
    Linux >= 2d5f5611dd0de52e9a52b56391a7049a52184e72 <
    2e509ef60ee41a2da0deb062c262bb530143fb37
  - >-
    Linux >= 2d5f5611dd0de52e9a52b56391a7049a52184e72 <
    c83e79c0842ed29860648bcce5022ef0ba5001c6
  - Linux 4.6
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-10-16T19:17:35.214904Z'
published: '2026-08-26'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T19:26:27.388Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-80572'
references:
  - url: 'https://git.kernel.org/stable/c/84b205297fa15f97510342221d8c9a0119711478'
  - url: 'https://git.kernel.org/stable/c/28d984a66b9e14be74986167b6ad40b5e0daf19a'
  - url: 'https://git.kernel.org/stable/c/ee944a706a18322b4a2599eebe8040a2994e928f'
  - url: 'https://git.kernel.org/stable/c/8dbfd8e32a13e116790780ed0be82b5a05eb9916'
  - url: 'https://git.kernel.org/stable/c/2e509ef60ee41a2da0deb062c262bb530143fb37'
  - url: 'https://git.kernel.org/stable/c/c83e79c0842ed29860648bcce5022ef0ba5001c6'
tags:
  - cve.org
epss: 0.0012
epssPercentile: 0.01715
ingestedAt: '2026-10-16T19:46:24.313Z'
---

## Overview

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

Input: byd - synchronize timer deletion before freeing private data

byd_disconnect() uses timer_delete() before freeing the driver's private
data.  This does not wait for a running byd_clear_touch() callback, which
dereferences the private data and its psmouse pointer.  A callback racing
with disconnect can therefore access the private data after it has been
freed.  The timer can also still be re-armed by byd_process_byte() while
the disconnect is in progress.

Use timer_shutdown_sync() before freeing the private data: it waits for
a running callback and turns any later re-arm attempt into a no-op.

## Affected

- `Linux >= 2d5f5611dd0de52e9a52b56391a7049a52184e72 < 84b205297fa15f97510342221d8c9a0119711478`
- `Linux >= 2d5f5611dd0de52e9a52b56391a7049a52184e72 < 28d984a66b9e14be74986167b6ad40b5e0daf19a`
- `Linux >= 2d5f5611dd0de52e9a52b56391a7049a52184e72 < ee944a706a18322b4a2599eebe8040a2994e928f`
- `Linux >= 2d5f5611dd0de52e9a52b56391a7049a52184e72 < 8dbfd8e32a13e116790780ed0be82b5a05eb9916`
- `Linux >= 2d5f5611dd0de52e9a52b56391a7049a52184e72 < 2e509ef60ee41a2da0deb062c262bb530143fb37`
- `Linux >= 2d5f5611dd0de52e9a52b56391a7049a52184e72 < c83e79c0842ed29860648bcce5022ef0ba5001c6`
- `Linux 4.6`

## Remediation

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