---
id: CVE-2026-80765
title: 'HID: hyperv: validate initial device info bounds'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  HID: hyperv: validate initial device info bounds

  The Hyper-V synthetic HID host supplies SYNTH_HID_INITIAL_DEVICE_INFO
  messages that contain a HID descriptor followed …
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= b95f5bcb811e3905b5376f87789da8d097fee682 <
    e0d5d3e45e142b7ef7525654aaa54d3e986002a6
  - >-
    Linux >= b95f5bcb811e3905b5376f87789da8d097fee682 <
    390d3d9c52a710fdc9de95a537747397c0c671d1
  - >-
    Linux >= b95f5bcb811e3905b5376f87789da8d097fee682 <
    8614c043b11cc35ffebd35542ab4da275f8f923d
  - >-
    Linux >= b95f5bcb811e3905b5376f87789da8d097fee682 <
    334271d3812ab3197c95b4593bc6745f8d189114
  - >-
    Linux >= b95f5bcb811e3905b5376f87789da8d097fee682 <
    f84d777574b748b1a488723ca7be9d87a301a872
  - >-
    Linux >= b95f5bcb811e3905b5376f87789da8d097fee682 <
    608f8fd8c0f7b6268da43509447802955f210aac
  - >-
    Linux >= b95f5bcb811e3905b5376f87789da8d097fee682 <
    2529737763cb4bcfcaf397beeea2664656c865b4
  - >-
    Linux >= b95f5bcb811e3905b5376f87789da8d097fee682 <
    c894143c508a7e063aab9f73c9e835ab40121283
  - >-
    Linux >= b95f5bcb811e3905b5376f87789da8d097fee682 <
    934b7778aa7b7c8f6bb073d2a73ba3674885bae0
  - Linux 3.3
published: '2026-09-04'
updated: '2026-10-19'
sourceUpdated: '2026-10-19T08:43:21.769Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-80765'
references:
  - url: 'https://git.kernel.org/stable/c/e0d5d3e45e142b7ef7525654aaa54d3e986002a6'
  - url: 'https://git.kernel.org/stable/c/390d3d9c52a710fdc9de95a537747397c0c671d1'
  - url: 'https://git.kernel.org/stable/c/8614c043b11cc35ffebd35542ab4da275f8f923d'
  - url: 'https://git.kernel.org/stable/c/334271d3812ab3197c95b4593bc6745f8d189114'
  - url: 'https://git.kernel.org/stable/c/f84d777574b748b1a488723ca7be9d87a301a872'
  - url: 'https://git.kernel.org/stable/c/608f8fd8c0f7b6268da43509447802955f210aac'
  - url: 'https://git.kernel.org/stable/c/2529737763cb4bcfcaf397beeea2664656c865b4'
  - url: 'https://git.kernel.org/stable/c/c894143c508a7e063aab9f73c9e835ab40121283'
  - url: 'https://git.kernel.org/stable/c/934b7778aa7b7c8f6bb073d2a73ba3674885bae0'
tags:
  - cve.org
epss: 0.00195
epssPercentile: 0.08585
ingestedAt: '2026-10-19T10:20:54.952Z'
---

## Overview

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

HID: hyperv: validate initial device info bounds

The Hyper-V synthetic HID host supplies SYNTH_HID_INITIAL_DEVICE_INFO
messages that contain a HID descriptor followed by the report descriptor
bytes. mousevsc_on_receive_device_info() trusts bLength and
wDescriptorLength without checking that the received packet contains both
byte ranges.

A malformed host or backend message can therefore make the guest read
past the received VMBus packet while copying the report descriptor. Pass
the received initial-device-info size into the parser and reject
descriptor lengths that exceed the packet.

Impact: A malicious Hyper-V host or backend can crash a guest by sending
a short initial device-info message with an oversized HID report
descriptor length.

## Affected

- `Linux >= b95f5bcb811e3905b5376f87789da8d097fee682 < e0d5d3e45e142b7ef7525654aaa54d3e986002a6`
- `Linux >= b95f5bcb811e3905b5376f87789da8d097fee682 < 390d3d9c52a710fdc9de95a537747397c0c671d1`
- `Linux >= b95f5bcb811e3905b5376f87789da8d097fee682 < 8614c043b11cc35ffebd35542ab4da275f8f923d`
- `Linux >= b95f5bcb811e3905b5376f87789da8d097fee682 < 334271d3812ab3197c95b4593bc6745f8d189114`
- `Linux >= b95f5bcb811e3905b5376f87789da8d097fee682 < f84d777574b748b1a488723ca7be9d87a301a872`
- `Linux >= b95f5bcb811e3905b5376f87789da8d097fee682 < 608f8fd8c0f7b6268da43509447802955f210aac`
- `Linux >= b95f5bcb811e3905b5376f87789da8d097fee682 < 2529737763cb4bcfcaf397beeea2664656c865b4`
- `Linux >= b95f5bcb811e3905b5376f87789da8d097fee682 < c894143c508a7e063aab9f73c9e835ab40121283`
- `Linux >= b95f5bcb811e3905b5376f87789da8d097fee682 < 934b7778aa7b7c8f6bb073d2a73ba3674885bae0`
- `Linux 3.3`

## Remediation

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