---
id: CVE-2026-90369
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  wifi: mt76: fix out-of-bounds access in mmio copy helpers

  mt76_mmio_write_copy() and mt76_mmio_read_copy() iterate up to
  ALIGN(len, 4), so a length that is not a multi…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  wifi: mt76: fix out-of-bounds access in mmio copy helpers

  mt76_mmio_write_copy() and mt76_mmio_read_copy() iterate up to
  ALIGN(len, 4), so a length that is not a multi…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 2df00805f7dbaa46b60c682aad0d76270b7ba266 <
    6ed0fba58bb125a8d8de96e391aa86111166efca
  - >-
    Linux >= 2df00805f7dbaa46b60c682aad0d76270b7ba266 <
    6689b4a65e88d7b019e687fa9d6943ca070f3e43
  - Linux 6.19
published: '2026-09-17'
updated: '2026-09-17'
sourceUpdated: '2026-09-17T17:17:36.030'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-90369'
references:
  - url: 'https://git.kernel.org/stable/c/6689b4a65e88d7b019e687fa9d6943ca070f3e43'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/6ed0fba58bb125a8d8de96e391aa86111166efca'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
ingestedAt: '2026-09-17T16:21:47.809Z'
epss: 0.00198
epssPercentile: 0.08467
---

## Overview

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

wifi: mt76: fix out-of-bounds access in mmio copy helpers

mt76_mmio_write_copy() and mt76_mmio_read_copy() iterate up to
ALIGN(len, 4), so a length that is not a multiple of four reads past the
source buffer (write_copy) or writes past the destination (read_copy).
Copy the aligned body in the loop and handle the remaining tail through a
4-byte bounce buffer, keeping the register access width unchanged.

## Remediation

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