SB2026100716 - Use of Uninitialized Variable in Linux kernel brcmfmac cyw driver
Published: October 7, 2026
Security Bulletin ID
SB2026100716
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Information disclosure
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Use of Uninitialized Variable (CVE-ID: CVE-2026-98350)
CWE-ID: CWE-457 - Use of Uninitialized Variable
CVSSv4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a local user to disclose stack memory to the wireless firmware.
The vulnerability exists due to use of an uninitialized authentication status structure in brcmf_cyw_external_auth() when processing external authentication parameters. A local user can initiate external authentication with an SSID shorter than 32 bytes or a supplied PMKID to disclose stack memory to the wireless firmware.
Remediation
Install update from vendor's website.