---
id: CVE-2026-90017
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  staging: rtl8723bs: fix OOB read in rtw_action_frame_parse()

  rtw_action_frame_parse() takes a frame_len parameter but never
  actually checks it before indexing into the…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  staging: rtl8723bs: fix OOB read in rtw_action_frame_parse()

  rtw_action_frame_parse() takes a frame_len parameter but never
  actually checks it before indexing into the…
severity: high
cvss: 7.1
cvssVector: 'CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H'
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 554c0a3abf216c991c5ebddcdb2c08689ecd290b <
    15081ff835b29e456da29303b32efc436df04695
  - >-
    Linux >= 554c0a3abf216c991c5ebddcdb2c08689ecd290b <
    310aaa8058d19cc431aedac0f5bb814e84479393
  - >-
    Linux >= 554c0a3abf216c991c5ebddcdb2c08689ecd290b <
    1410bce22351ba15d8e58287cbf09d55d7f21fc9
  - >-
    Linux >= 554c0a3abf216c991c5ebddcdb2c08689ecd290b <
    0b7f64c7bb9664777168768c6b44affb07dcbf24
  - >-
    Linux >= 554c0a3abf216c991c5ebddcdb2c08689ecd290b <
    136f9a3ab87ded8aaf081425cfb2059659dd9023
  - >-
    Linux >= 554c0a3abf216c991c5ebddcdb2c08689ecd290b <
    b041e3f35e0d262d42a711094ab594634d72744a
  - >-
    Linux >= 554c0a3abf216c991c5ebddcdb2c08689ecd290b <
    a54fd1a44862d263df9f8bc17fca3620be31addb
  - >-
    Linux >= 554c0a3abf216c991c5ebddcdb2c08689ecd290b <
    ff917923f4fb9c83717ba135ee47d7e4c1567bb7
  - Linux 4.12
published: '2026-09-16'
updated: '2026-09-16'
sourceUpdated: '2026-09-16T15:18:25.347'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-90017'
references:
  - url: 'https://git.kernel.org/stable/c/0b7f64c7bb9664777168768c6b44affb07dcbf24'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/136f9a3ab87ded8aaf081425cfb2059659dd9023'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/1410bce22351ba15d8e58287cbf09d55d7f21fc9'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/15081ff835b29e456da29303b32efc436df04695'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/310aaa8058d19cc431aedac0f5bb814e84479393'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/a54fd1a44862d263df9f8bc17fca3620be31addb'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/b041e3f35e0d262d42a711094ab594634d72744a'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/ff917923f4fb9c83717ba135ee47d7e4c1567bb7'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
ingestedAt: '2026-09-16T10:53:53.939Z'
epss: 0.00405
epssPercentile: 0.31948
---

## Overview

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

staging: rtl8723bs: fix OOB read in rtw_action_frame_parse()

rtw_action_frame_parse() takes a frame_len parameter but never
actually checks it before indexing into the frame body:

	const u8 *frame_body = frame + sizeof(struct ieee80211_hdr_3addr);
	...
	c = frame_body[0];
	...
	a = frame_body[1];

frame_body already points 24 bytes (sizeof(struct
ieee80211_hdr_3addr)) into frame, so reading frame_body[0] and
frame_body[1] requires frame_len >= 26. A management action frame
shorter than that (e.g. exactly 24 bytes, the minimum a malicious
peer can send) causes a 1-2 byte out-of-bounds read.

This is reachable from rtw_cfg80211_monitor_if_xmit_entry() and
cfg80211_rtw_mgmt_tx() in ioctl_cfg80211.c, both of which pass
attacker/user-influenced frame buffers and lengths straight through.

Add the missing length check before frame_body is dereferenced.

## Remediation

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