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CVE-2026-80772

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

Description (CNA)

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 (CNA)

Vendor / productVersions
Linux / Linuxaffected 2af16c1f846bd60240745bbd3afa13d5f040c61a before 33ea29f8b6141f2d265de807e110a6435b355cb0; affected 2af16c1f846bd60240745bbd3afa13d5f040c61a before bd397c4123a4bc084913d8c7fdb40ef94e9f8172; affected 2af16c1f846bd60240745bbd3afa13d5f040c61a before addca61f9a23c0d20a387c2040e70479f54518e1; affected 2af16c1f846bd60240745bbd3afa13d5f040c61a before 51cfd1adbe7a46bb08af162abb3ab3b6820e2d15; affected 2af16c1f846bd60240745bbd3afa13d5f040c61a before d4cabd4089adb59cf7974915737c52cc47a9bb1b; affected 2af16c1f846bd60240745bbd3afa13d5f040c61a before 34725ed4719da424113db8449fb5485aaf71a913; affected 2af16c1f846bd60240745bbd3afa13d5f040c61a before 27b376b945c0aac46fcdfcc950b14a85b874b557
Linux / Linuxaffected 5.16; unaffected 0 before 5.16; unaffected 6.1.185 through 6.1.*; unaffected 6.6.154 through 6.6.*; unaffected 6.12.106 through 6.12.*; unaffected 6.18.47 through 6.18.*; unaffected 7.1.11 through 7.1.*; unaffected 7.2.1 through 7.2.*; unaffected 7.3 through *

CWE

No CWE identifiers supplied.

References