SB20261023106 - Use-after-free in Linux kernel brcm80211 brcmfmac driver

CSH
CYBERSECURITY HELP
Sign In REGISTER

Main Vulnerability Database SB20261023106

SB20261023106 - Use-after-free in Linux kernel brcm80211 brcmfmac driver

Published: October 23, 2026

Security Bulletin ID SB20261023106
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Denial of service

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Use-after-free (CVE-ID: CVE-2026-99061)

CWE-ID: CWE-416 - Use After Free

CVSSv4: 5.6 [CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a local privileged user to cause a denial of service by crashing the kernel.

The vulnerability exists due to a use-after-free caused by a race condition in the brcmfmac driver's brcmf_detach() function when driver removal overlaps with removal of a P2P device interface by an exiting user-space process. A local privileged user can remove the driver while the process that created the P2P device is still exiting to trigger duplicate interface unregistration and access to freed memory, causing a kernel crash.


Remediation

Install update from vendor's website.

References