Use of Uninitialized Variable in Linux kernel - CVE-2026-98350

Vulnerability identifier: #VU153644

CSH Severity: Low

CVSS v4: 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]

CVE-ID: CVE-2026-98350

CWE-ID: CWE-457

Exploitation vector: Local access

Exploit availability: No public exploit available

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.

Linux kernel
Ubuntu
linux (Ubuntu package)
linux-aws (Ubuntu package)
linux-gcp (Ubuntu package)
linux-oracle (Ubuntu package)
linux-ibm (Ubuntu package)
linux-hwe-7.0 (Ubuntu package)
linux-oem-7.0 (Ubuntu package)

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
linux (Ubuntu package) - update to 7.0.0-42.42
linux-aws (Ubuntu package) - update to 7.0.0-1016.17
linux-gcp (Ubuntu package) - update to 7.0.0-1016.18
linux-oracle (Ubuntu package) - update to 7.0.0-1015.16
linux-ibm (Ubuntu package) - update to 7.0.0-1017.17
linux-hwe-7.0 (Ubuntu package) - update to 7.0.0-42.42~24.04.1
linux-oem-7.0 (Ubuntu package) - update to 7.0.0-1017.17

• https://git.kernel.org/stable/c/6fba6233e9ca7718661e53555a3961c58772c21a
• https://git.kernel.org/stable/c/c2cf589c7d546557ed60c43f2ec014279265dfbf
• https://git.kernel.org/stable/c/e2de8d5eb2984416affdd9559e55f37c7f1bbf47

• Use of Uninitialized Variable in Linux kernel brcmfmac cyw driver
• Ubuntu update for linux-oem-7.0
• Ubuntu update for linux, linux-aws, linux-gcp and more