SB20260727117 - Improper input validation in Linux kernel rtl8723bs core driver
Published: July 27, 2026
Security Bulletin ID
SB20260727117
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Partial DoS
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Improper input validation (CVE-ID: CVE-2026-64445)
CWE-ID: CWE-20 - Improper input validation
CVSSv4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to improper input validation in OnAuth() when processing seq=3 shared-key authentication responses. A remote attacker can send a specially crafted authentication frame to cause a denial of service.
The issue is triggered when the Challenge Text information element length differs from the required 128 bytes.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/1f6c9d255bdda41216b6e34c96aa2b1abee0bb84
- https://git.kernel.org/stable/c/3e44a7665f3abd320a80d9c64ee4a93317041b8b
- https://git.kernel.org/stable/c/64ec4192d9c10e96922245d4a6747304cc76b19d
- https://git.kernel.org/stable/c/665e1ecb68b4e8419604e70a33f02d1c8b0222c6
- https://git.kernel.org/stable/c/87cccc2a767f17dcab71e3b9fe5ae29b5516c5ce
- https://git.kernel.org/stable/c/a1fc19d61f661d47204f095b593de507884849f7
- https://git.kernel.org/stable/c/c9000c93078e5c0a5a651b077c0ec92a4bc7d580
- https://git.kernel.org/stable/c/d90b9f39f375c9826ef145605dfe97765d0ecb91