SB20260727128 - Out-of-bounds write in Linux kernel rtl8723bs core driver

CSH
CYBERSECURITY HELP
Sign In REGISTER

Main Vulnerability Database SB20260727128

SB20260727128 - Out-of-bounds write in Linux kernel rtl8723bs core driver

Published: July 27, 2026

Security Bulletin ID SB20260727128
CSH Severity
High
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Adjecent network
Highest impact Data manipulation

Breakdown by Severity

High 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Out-of-bounds write (CVE-ID: CVE-2026-64440)

CWE-ID: CWE-787 - Out-of-bounds write

CVSSv4: CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber


The vulnerability allows a remote attacker to cause memory corruption.

The vulnerability exists due to an out-of-bounds write in HT_caps_handler() when parsing a crafted 802.11 association response frame. A remote attacker can send a malicious access point response with an oversized HT Capabilities information element to cause memory corruption.

The issue can write beyond the fixed 26-byte HT_cap array into adjacent fields of struct mlme_ext_info.


Remediation

Install update from vendor's website.

References