Use-after-free in Linux kernel - CVE-2026-64453
Published: July 27, 2026
Vulnerability identifier: #VU139483
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-2026-64453
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 usbio_disconnect() in drivers/usb/misc/usbio.c when disconnecting a USB interface and tearing down client auxiliary devices. A local user can trigger device disconnect handling to cause a denial of service.
The issue occurs because reverse iteration over the client list can dereference freed memory after an unbound child device is uninitialized.
Affected software
Linux kernel
How to mitigate CVE-2026-64453
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3