Copyright © 2012 Red Hat, Inc. All rights reserved. Moderate 2026-08-22T00:00:00 kernel: serial: amba-pl011: cancel RS485 hrtimers after freeing IRQ 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CWE-825

In the Linux kernel, the following vulnerability has been resolved: serial: amba-pl011: cancel RS485 hrtimers after freeing IRQ The RS485 trigger hrtimers are embedded in the devm-managed port and can fire after it is freed. The IRQ handler can arm a timer, so free the IRQ first and then cancel both timers. Complete the RS485 stop without arming a timer, and cancel the timers in remove() for the suspend-then-unbind path, where shutdown is not called. This issue was found by an in-house static analysis tool.

A flaw was found in the Linux kernel's amba-pl011 serial driver. The RS485 trigger high-resolution timers (hrtimers) can fire after the device management (devm)-managed port is freed. This occurs because the timers are not properly canceled before the interrupt request (IRQ) is freed, allowing a use-after-free condition. A local attacker could potentially exploit this to cause a denial of service.

Red Hat Enterprise Linux 10 Not affected kernel Red Hat Enterprise Linux 6 Not affected kernel Red Hat Enterprise Linux 7 Not affected kernel Red Hat Enterprise Linux 7 Not affected kernel-rt Red Hat Enterprise Linux 8 Not affected kernel Red Hat Enterprise Linux 8 Not affected kernel-rt Red Hat Enterprise Linux 9 Not affected kernel Red Hat Enterprise Linux 9 Not affected kernel-rt https://www.cve.org/CVERecord?id=CVE-2026-74652 https://nvd.nist.gov/vuln/detail/CVE-2026-74652 https://lore.kernel.org/linux-cve-announce/2026082226-CVE-2026-74652-3d26@gregkh/T