---
id: CVE-2026-64443
title: 'staging: rtl8723bs: fix OOB read in update_beacon_info() IE loop'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  staging: rtl8723bs: fix OOB read in update_beacon_info() IE loop

  The IE parsing loop in update_beacon_info() advances by
  (pIE->length + 2) each iteration but only guar…
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 >= 554c0a3abf216c991c5ebddcdb2c08689ecd290b <
    5e8db4cff5b45c7c4edc8ae3f302027c3bb32b25
  - >-
    Linux >= 554c0a3abf216c991c5ebddcdb2c08689ecd290b <
    6dd5e8c3011ebabf417257d7f07901a7c4311539
  - >-
    Linux >= 554c0a3abf216c991c5ebddcdb2c08689ecd290b <
    9193c34f75fd9e1ea8a590d7cced464c3380dc29
  - >-
    Linux >= 554c0a3abf216c991c5ebddcdb2c08689ecd290b <
    bd953d52d587d42365e399b96c52dbdb13032070
  - >-
    Linux >= 554c0a3abf216c991c5ebddcdb2c08689ecd290b <
    69f174a0673b6b7a29b851adb60bc450cdc0ecc4
  - >-
    Linux >= 554c0a3abf216c991c5ebddcdb2c08689ecd290b <
    b5cc2f999927f69723ca53f1f2a3aa37dbeda907
  - >-
    Linux >= 554c0a3abf216c991c5ebddcdb2c08689ecd290b <
    ed51de4a86e173c3b0ef78e039c2e49e08b11f16
  - Linux 4.12
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-10-16T15:40:53.876241Z'
published: '2026-07-25'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T15:42:36.546Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-64443'
references:
  - url: 'https://git.kernel.org/stable/c/5e8db4cff5b45c7c4edc8ae3f302027c3bb32b25'
  - url: 'https://git.kernel.org/stable/c/6dd5e8c3011ebabf417257d7f07901a7c4311539'
  - url: 'https://git.kernel.org/stable/c/9193c34f75fd9e1ea8a590d7cced464c3380dc29'
  - url: 'https://git.kernel.org/stable/c/bd953d52d587d42365e399b96c52dbdb13032070'
  - url: 'https://git.kernel.org/stable/c/69f174a0673b6b7a29b851adb60bc450cdc0ecc4'
  - url: 'https://git.kernel.org/stable/c/b5cc2f999927f69723ca53f1f2a3aa37dbeda907'
  - url: 'https://git.kernel.org/stable/c/ed51de4a86e173c3b0ef78e039c2e49e08b11f16'
tags:
  - cve.org
epss: 0.0028
epssPercentile: 0.19093
ingestedAt: '2026-10-16T17:24:46.820Z'
---

## Overview

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

staging: rtl8723bs: fix OOB read in update_beacon_info() IE loop

The IE parsing loop in update_beacon_info() advances by
(pIE->length + 2) each iteration but only guards on i < len.
When a malicious AP sends a Beacon whose last IE has only one byte
remaining in the frame (the element_id byte lands at len-1), the loop
reads pIE->length from one byte past the allocated receive buffer.

Additionally, even when the header bytes are in bounds, pIE->length
itself can extend the data window beyond len, passing a truncated IE
to the handler functions.

Add two guards at the top of the loop body:
  1. Break if fewer than sizeof(*pIE) bytes remain (can't read header).
  2. Break if the IE's declared data extends past len.

Also replace i += (pIE->length + 2) with i += sizeof(*pIE) + pIE->length
for consistency with the sizeof(*pIE) guards added above.

## Affected

- `Linux >= 554c0a3abf216c991c5ebddcdb2c08689ecd290b < 5e8db4cff5b45c7c4edc8ae3f302027c3bb32b25`
- `Linux >= 554c0a3abf216c991c5ebddcdb2c08689ecd290b < 6dd5e8c3011ebabf417257d7f07901a7c4311539`
- `Linux >= 554c0a3abf216c991c5ebddcdb2c08689ecd290b < 9193c34f75fd9e1ea8a590d7cced464c3380dc29`
- `Linux >= 554c0a3abf216c991c5ebddcdb2c08689ecd290b < bd953d52d587d42365e399b96c52dbdb13032070`
- `Linux >= 554c0a3abf216c991c5ebddcdb2c08689ecd290b < 69f174a0673b6b7a29b851adb60bc450cdc0ecc4`
- `Linux >= 554c0a3abf216c991c5ebddcdb2c08689ecd290b < b5cc2f999927f69723ca53f1f2a3aa37dbeda907`
- `Linux >= 554c0a3abf216c991c5ebddcdb2c08689ecd290b < ed51de4a86e173c3b0ef78e039c2e49e08b11f16`
- `Linux 4.12`

## Remediation

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