SB2026091241 - Use-after-free in Linux kernel gadget udc driver
Published: September 12, 2026
Security Bulletin ID
SB2026091241
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Use-after-free (CVE-ID: CVE-2026-89738)
CWE-ID: CWE-416 - Use After Free
CVSSv4: 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]
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.
Remediation
Install update from vendor's website.