Use-after-free in Linux kernel - CVE-2026-89523
Published: September 12, 2026
Vulnerability identifier: #VU149274
CSH Severity: Low
CVSS v4: 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]
CVE-ID: CVE-2026-89523
CWE-ID: CWE-416
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to use-after-free in the mt7925 Wi-Fi driver mlo_pm_work delayed work handler when the device is reset, suspended, or unregistered while the work is pending. A local user can trigger a device reset, suspension, or unregistration while the work is pending to cause a denial of service.
Pending work may send MCU commands while firmware is unavailable.
Affected software
Linux kernel
How to mitigate CVE-2026-89523
Install security update from vendor's repository.