CVE-2026-89738 Linux Kernel usb gadget at91_udc - Use After Free

Linux kernel usb gadget at91_udc contains a use-after-free vulnerability caused by a polled-VBUS timer and work item dereferencing freed memory during device removal, letting attackers cause system instability or denial of service, exploit requires device unbind or driver removal.

CVSS base score 7.8 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
EPSS
0.17% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Use After Free
Impact
Denial Of Service
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Published
11 September 2026
Updated
15 October 2026

Vendor fix

Update to the latest Linux kernel version containing the fix for at91_udc timer/work shutdown.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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