Always-Incorrect Control Flow Implementation in Linux kernel - CVE-2026-74653
Published: August 24, 2026
Vulnerability identifier: #VU144889
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-2026-74653
CWE-ID: CWE-670
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 improper handling of a stuck RX timeout condition in 8250_of for the LPC32xx UART when handling serial port interrupts. A local user can repeatedly open the front-panel serial port to cause a denial of service.
The issue can trigger a persistent interrupt storm that livelocks the CPU and trips the soft-lockup detector on affected single-core systems.
Affected software
Linux kernel
Debian Linux
linux (Debian package)
Debian Linux
linux (Debian package)
How to mitigate CVE-2026-74653
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3
linux (Debian package) - update to 6.12.107-1
linux (Debian package) - update to 6.12.107-1