SB20260812218 - Improper Initialization in Linux kernel brcm80211 brcmfmac driver

Description

This security bulletin contains information about 1 vulnerability.

1) Improper Initialization (CVE-ID: CVE-2026-68304)

CWE-ID: CWE-665 - Improper Initialization

CVSSv4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to improper initialization in the brcmfmac cfg80211 key management handling when processing 802.1X-SHA256 PMK configuration requests. A local user can send a crafted netlink request to trigger a kernel warning and cause a denial of service.

The issue occurs when 802.1X-SHA256 mode is used without the required firmware supplicant configuration.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/00ebbf030d8c4a1cb89cbbae15e28332373649db
• https://git.kernel.org/stable/c/137e4710da626290495b174e2eb1d5e889a4b165
• https://git.kernel.org/stable/c/7cb34f6c4fe8a68af621d870abe63bfca2275dd6
• https://git.kernel.org/stable/c/bd4fac033bb95fcad898cf6734e869991b2561cb
• https://git.kernel.org/stable/c/d3ac5b35ec85c41ccf8ec524d47b520e72edaca1