CVE-2026-89622

kernel: HID: mcp2221: clear rxbuf after I2C/SMBus transfer completes

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Severity

Moderate

Red Hat Product Security

5.5

CVSS 3.1

Review impact separately from score.

Published · September 11, 2026

Updated · October 30, 2026

Description

A flaw was found in the Linux kernel's HID (Human Interface Device) subsystem, specifically in the mcp2221 driver. This vulnerability occurs because the driver fails to clear a buffer pointer after an I2C/SMBus transfer completes. A local attacker could exploit this by triggering a delayed or unexpected report, leading to a use-after-free condition. This could result in arbitrary code execution or a denial of service.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

No mitigation is specified in collected source.

CVSS / CWE

CVSS 3.1 · 5.5
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CWE-825 · Expired Pointer Dereference