---
id: CVE-2026-80783
title: 'HID: magicmouse: prevent unbounded recursion in magicmouse_raw_event()'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  HID: magicmouse: prevent unbounded recursion in magicmouse_raw_event()

  magicmouse_raw_event() handles DOUBLE_REPORT_ID (0xf7) packets, which pack
  two touch reports int…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= a462230e16acc8664145216da3c928d03556691a <
    26c45abed62536aabf4033fb6d64cf72e93374e9
  - >-
    Linux >= a462230e16acc8664145216da3c928d03556691a <
    8a10a624996f16628234306b46f0cf36707d78bd
  - >-
    Linux >= a462230e16acc8664145216da3c928d03556691a <
    d16df755b4493b6d37803c628b2c621d096796a8
  - >-
    Linux >= a462230e16acc8664145216da3c928d03556691a <
    bec338b07beb883726b32192c8f01c601bc76fda
  - >-
    Linux >= a462230e16acc8664145216da3c928d03556691a <
    70589b0c005db003f6d8ae4db3c4d54fed7b83e4
  - >-
    Linux >= a462230e16acc8664145216da3c928d03556691a <
    a33a596d3ad8dfe6c96a368097a028abeee16c17
  - >-
    Linux >= a462230e16acc8664145216da3c928d03556691a <
    d095de37f78c5f32a4252ef0f99b84ba76550b86
  - >-
    Linux >= a462230e16acc8664145216da3c928d03556691a <
    db8d634128d2ba88d79c0b601e983ebe14bb0519
  - Linux 2.6.37
published: '2026-09-04'
updated: '2026-10-19'
sourceUpdated: '2026-10-19T08:43:38.543Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-80783'
references:
  - url: 'https://git.kernel.org/stable/c/26c45abed62536aabf4033fb6d64cf72e93374e9'
  - url: 'https://git.kernel.org/stable/c/8a10a624996f16628234306b46f0cf36707d78bd'
  - url: 'https://git.kernel.org/stable/c/d16df755b4493b6d37803c628b2c621d096796a8'
  - url: 'https://git.kernel.org/stable/c/bec338b07beb883726b32192c8f01c601bc76fda'
  - url: 'https://git.kernel.org/stable/c/70589b0c005db003f6d8ae4db3c4d54fed7b83e4'
  - url: 'https://git.kernel.org/stable/c/a33a596d3ad8dfe6c96a368097a028abeee16c17'
  - url: 'https://git.kernel.org/stable/c/d095de37f78c5f32a4252ef0f99b84ba76550b86'
  - url: 'https://git.kernel.org/stable/c/db8d634128d2ba88d79c0b601e983ebe14bb0519'
tags:
  - cve.org
epss: 0.00195
epssPercentile: 0.08573
ingestedAt: '2026-10-19T10:20:54.956Z'
---

## Overview

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

HID: magicmouse: prevent unbounded recursion in magicmouse_raw_event()

magicmouse_raw_event() handles DOUBLE_REPORT_ID (0xf7) packets, which pack
two touch reports into one, by splitting the packet and calling itself on
each half. The only guard against runaway recursion is a "size < 1" check,
which stops zero-sized calls but does not bound the recursion depth.

A malicious HID device that matches this driver can send a report starting
with DOUBLE_REPORT_ID and filled with the sequence [0xf7, 0x00]. Each level
consumes two bytes and recurses on the remainder, so an incoming report of
up to HID_MAX_BUFFER_SIZE (16 KiB) drives roughly 8000 nested calls. That
easily exhausts the 16 KiB kernel stack, leading to a stack overflow: a
panic with CONFIG_VMAP_STACK, or memory corruption without it.

A double report only ever wraps two normal reports; it is never
legitimately nested. Refuse to re-enter the DOUBLE_REPORT_ID case from a
recursive call so the recursion depth is bounded to two, while all valid
packets keep being parsed exactly as before.

## Affected

- `Linux >= a462230e16acc8664145216da3c928d03556691a < 26c45abed62536aabf4033fb6d64cf72e93374e9`
- `Linux >= a462230e16acc8664145216da3c928d03556691a < 8a10a624996f16628234306b46f0cf36707d78bd`
- `Linux >= a462230e16acc8664145216da3c928d03556691a < d16df755b4493b6d37803c628b2c621d096796a8`
- `Linux >= a462230e16acc8664145216da3c928d03556691a < bec338b07beb883726b32192c8f01c601bc76fda`
- `Linux >= a462230e16acc8664145216da3c928d03556691a < 70589b0c005db003f6d8ae4db3c4d54fed7b83e4`
- `Linux >= a462230e16acc8664145216da3c928d03556691a < a33a596d3ad8dfe6c96a368097a028abeee16c17`
- `Linux >= a462230e16acc8664145216da3c928d03556691a < d095de37f78c5f32a4252ef0f99b84ba76550b86`
- `Linux >= a462230e16acc8664145216da3c928d03556691a < db8d634128d2ba88d79c0b601e983ebe14bb0519`
- `Linux 2.6.37`

## Remediation

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