Use-after-free in Linux kernel - CVE-2026-89738
Published: September 12, 2026
Vulnerability identifier: #VU149064
CSH Severity: Low
CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-89738
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 at91 UDC driver's polled-VBUS timer and work cycle when removing the driver while a timer callback or work item is pending or running. A local user can unbind the driver while a timer callback or work item is pending or running to cause a denial of service.
Only systems configured to use polled-VBUS mode are affected.
Affected software
Linux kernel
How to mitigate CVE-2026-89738
Install security update from vendor's repository.