Use-after-free in Linux kernel - CVE-2026-64491
Published: July 27, 2026
Vulnerability identifier: #VU139453
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-2026-64491
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 tascam_disconnect() in sound/usb/usx2y/us144mkii.c when handling device disconnect events and deferred USB work. A local user can trigger a device disconnect race to cause a denial of service.
The issue occurs because self-resubmitting URBs can complete after work cancellation and re-arm work that later runs on freed memory.
Affected software
Linux kernel
How to mitigate CVE-2026-64491
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3