---
id: CVE-2026-80772
title: 'HID: nintendo: fix out-of-bounds read in joycon_ctlr_read_handler()'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  HID: nintendo: fix out-of-bounds read in joycon_ctlr_read_handler()

  joycon_ctlr_read_handler() casts an incoming HID input report to
  struct joycon_input_report and par…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 2af16c1f846bd60240745bbd3afa13d5f040c61a <
    33ea29f8b6141f2d265de807e110a6435b355cb0
  - >-
    Linux >= 2af16c1f846bd60240745bbd3afa13d5f040c61a <
    bd397c4123a4bc084913d8c7fdb40ef94e9f8172
  - >-
    Linux >= 2af16c1f846bd60240745bbd3afa13d5f040c61a <
    addca61f9a23c0d20a387c2040e70479f54518e1
  - >-
    Linux >= 2af16c1f846bd60240745bbd3afa13d5f040c61a <
    51cfd1adbe7a46bb08af162abb3ab3b6820e2d15
  - >-
    Linux >= 2af16c1f846bd60240745bbd3afa13d5f040c61a <
    d4cabd4089adb59cf7974915737c52cc47a9bb1b
  - >-
    Linux >= 2af16c1f846bd60240745bbd3afa13d5f040c61a <
    34725ed4719da424113db8449fb5485aaf71a913
  - >-
    Linux >= 2af16c1f846bd60240745bbd3afa13d5f040c61a <
    27b376b945c0aac46fcdfcc950b14a85b874b557
  - Linux 5.16
published: '2026-09-04'
updated: '2026-10-19'
sourceUpdated: '2026-10-19T08:43:28.729Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-80772'
references:
  - url: 'https://git.kernel.org/stable/c/33ea29f8b6141f2d265de807e110a6435b355cb0'
  - url: 'https://git.kernel.org/stable/c/bd397c4123a4bc084913d8c7fdb40ef94e9f8172'
  - url: 'https://git.kernel.org/stable/c/addca61f9a23c0d20a387c2040e70479f54518e1'
  - url: 'https://git.kernel.org/stable/c/51cfd1adbe7a46bb08af162abb3ab3b6820e2d15'
  - url: 'https://git.kernel.org/stable/c/d4cabd4089adb59cf7974915737c52cc47a9bb1b'
  - url: 'https://git.kernel.org/stable/c/34725ed4719da424113db8449fb5485aaf71a913'
  - url: 'https://git.kernel.org/stable/c/27b376b945c0aac46fcdfcc950b14a85b874b557'
tags:
  - cve.org
epss: 0.00215
epssPercentile: 0.11049
ingestedAt: '2026-10-19T10:20:54.954Z'
---

## Overview

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

HID: nintendo: fix out-of-bounds read in joycon_ctlr_read_handler()

joycon_ctlr_read_handler() casts an incoming HID input report to
struct joycon_input_report and parses it, guarding the cast only with a
12-byte length check:

	if (size >= 12) /* make sure it contains the input report */
		joycon_parse_report(ctlr, (struct joycon_input_report *)data);

struct joycon_input_report is 49 bytes: a 13-byte header followed by a
union whose IMU arm is 36 bytes. For an IMU report joycon_parse_report()
-> joycon_parse_imu_report() walks that union (struct offsets 13..48),
so a report of exactly 12 bytes with data[0] == JC_INPUT_IMU_DATA passes
the guard yet is read up to 37 bytes past its declared length. The
over-read bytes are decoded into accelerometer/gyroscope values and
forwarded to userspace through the "(IMU)" input device, leaking
driver-internal memory. data[0] and size are fully controlled by a
malicious or spoofed Joy-Con/Pro Controller.

Receive buffers are sized to the maximum report length, so this is an
over-read within the allocation rather than a slab OOB, but the decoded
bytes still reach userspace.

The sibling subcmd path in joycon_ctlr_handle_event() already bounds the
same cast correctly:

	if (size < sizeof(struct joycon_input_report) ||
	    data[0] != JC_INPUT_SUBCMD_REPLY)
		break;

Use the same sizeof(struct joycon_input_report) bound here.

## Affected

- `Linux >= 2af16c1f846bd60240745bbd3afa13d5f040c61a < 33ea29f8b6141f2d265de807e110a6435b355cb0`
- `Linux >= 2af16c1f846bd60240745bbd3afa13d5f040c61a < bd397c4123a4bc084913d8c7fdb40ef94e9f8172`
- `Linux >= 2af16c1f846bd60240745bbd3afa13d5f040c61a < addca61f9a23c0d20a387c2040e70479f54518e1`
- `Linux >= 2af16c1f846bd60240745bbd3afa13d5f040c61a < 51cfd1adbe7a46bb08af162abb3ab3b6820e2d15`
- `Linux >= 2af16c1f846bd60240745bbd3afa13d5f040c61a < d4cabd4089adb59cf7974915737c52cc47a9bb1b`
- `Linux >= 2af16c1f846bd60240745bbd3afa13d5f040c61a < 34725ed4719da424113db8449fb5485aaf71a913`
- `Linux >= 2af16c1f846bd60240745bbd3afa13d5f040c61a < 27b376b945c0aac46fcdfcc950b14a85b874b557`
- `Linux 5.16`

## Remediation

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