Use-after-free in Linux kernel - CVE-2026-74652
Published: August 24, 2026
Vulnerability identifier: #VU144888
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-2026-74652
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 a use-after-free in the RS485 hrtimer handling in the amba-pl011 serial driver when removing or shutting down a device while timer callbacks can still be armed from the IRQ handler. A local user can trigger device shutdown or removal during RS485 activity to cause a denial of service.
The issue affects the suspend-then-unbind path, where shutdown is not called.
Affected software
Linux kernel
How to mitigate CVE-2026-74652
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3