---
id: CVE-2026-74410
title: 'wifi: rtw88: fix OOB read from firmware RX descriptor exceeding DMA buffer'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  wifi: rtw88: fix OOB read from firmware RX descriptor exceeding DMA buffer

  In rtw_pci_rx_napi(), new_len is computed as the sum of pkt_len (14-bit
  descriptor field, ma…
severity: high
cvss: 8.1
cvssVector: 'CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H'
cvssSource: cna
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= e3037485c68ec1a299ff41160d8fedbd4abc29b9 <
    913bd7d3d3d842b5c1d2b908a0201efa8fc79793
  - >-
    Linux >= e3037485c68ec1a299ff41160d8fedbd4abc29b9 <
    45abc14ab3f15da7d689f1a8809c1a01240a94d9
  - >-
    Linux >= e3037485c68ec1a299ff41160d8fedbd4abc29b9 <
    08193e733e5d4790e6c937af86d78793b02709be
  - >-
    Linux >= e3037485c68ec1a299ff41160d8fedbd4abc29b9 <
    6a3c384393d3f0b41669ed5a2e88744aad9d87c8
  - >-
    Linux >= e3037485c68ec1a299ff41160d8fedbd4abc29b9 <
    26c183a86ea4dd1f2ff90c6f783649e7f5722a10
  - >-
    Linux >= e3037485c68ec1a299ff41160d8fedbd4abc29b9 <
    01155ded5d4dad61840a9a3c33ab56778ef1f100
  - >-
    Linux >= e3037485c68ec1a299ff41160d8fedbd4abc29b9 <
    1554fa522f16ec7c5c342ad33fe734eeb6eb2452
  - >-
    Linux >= e3037485c68ec1a299ff41160d8fedbd4abc29b9 <
    6e76e9ed273dfb4b3333a5ebbb94958cc5752ab6
  - Linux 5.2
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-10-16T18:56:04.346060Z'
published: '2026-08-15'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T19:05:43.968Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-74410'
references:
  - url: 'https://git.kernel.org/stable/c/913bd7d3d3d842b5c1d2b908a0201efa8fc79793'
  - url: 'https://git.kernel.org/stable/c/45abc14ab3f15da7d689f1a8809c1a01240a94d9'
  - url: 'https://git.kernel.org/stable/c/08193e733e5d4790e6c937af86d78793b02709be'
  - url: 'https://git.kernel.org/stable/c/6a3c384393d3f0b41669ed5a2e88744aad9d87c8'
  - url: 'https://git.kernel.org/stable/c/26c183a86ea4dd1f2ff90c6f783649e7f5722a10'
  - url: 'https://git.kernel.org/stable/c/01155ded5d4dad61840a9a3c33ab56778ef1f100'
  - url: 'https://git.kernel.org/stable/c/1554fa522f16ec7c5c342ad33fe734eeb6eb2452'
  - url: 'https://git.kernel.org/stable/c/6e76e9ed273dfb4b3333a5ebbb94958cc5752ab6'
tags:
  - cve.org
epss: 0.00419
epssPercentile: 0.34712
ingestedAt: '2026-10-16T19:46:24.366Z'
---

## Overview

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

wifi: rtw88: fix OOB read from firmware RX descriptor exceeding DMA buffer

In rtw_pci_rx_napi(), new_len is computed as the sum of pkt_len (14-bit
descriptor field, max 16383) and pkt_offset (drv_info_sz + shift, both
firmware-controlled). The result can exceed RTK_PCI_RX_BUF_SIZE (11478),
causing an out-of-bounds read from the pre-allocated DMA buffer when
skb_put_data copies new_len bytes. The USB transport already validates
this (rtw_usb_rx_data_put checks against RTW_USB_MAX_RECVBUF_SZ); the
PCIe path does not.

Add a check that new_len does not exceed the DMA buffer size.

## Affected

- `Linux >= e3037485c68ec1a299ff41160d8fedbd4abc29b9 < 913bd7d3d3d842b5c1d2b908a0201efa8fc79793`
- `Linux >= e3037485c68ec1a299ff41160d8fedbd4abc29b9 < 45abc14ab3f15da7d689f1a8809c1a01240a94d9`
- `Linux >= e3037485c68ec1a299ff41160d8fedbd4abc29b9 < 08193e733e5d4790e6c937af86d78793b02709be`
- `Linux >= e3037485c68ec1a299ff41160d8fedbd4abc29b9 < 6a3c384393d3f0b41669ed5a2e88744aad9d87c8`
- `Linux >= e3037485c68ec1a299ff41160d8fedbd4abc29b9 < 26c183a86ea4dd1f2ff90c6f783649e7f5722a10`
- `Linux >= e3037485c68ec1a299ff41160d8fedbd4abc29b9 < 01155ded5d4dad61840a9a3c33ab56778ef1f100`
- `Linux >= e3037485c68ec1a299ff41160d8fedbd4abc29b9 < 1554fa522f16ec7c5c342ad33fe734eeb6eb2452`
- `Linux >= e3037485c68ec1a299ff41160d8fedbd4abc29b9 < 6e76e9ed273dfb4b3333a5ebbb94958cc5752ab6`
- `Linux 5.2`

## Remediation

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