Improper Initialization in Linux kernel - CVE-2026-23472
Published: April 6, 2026
Vulnerability identifier: #VU124898
CSH Severity: Low
CVSS v4.0: 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/E:U/U:Clear
CVE-ID: CVE-2026-23472
CWE-ID: CWE-665
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to improper initialization handling in handle_tx() when processing PORT_UNKNOWN serial ports. A local user can use a PORT_UNKNOWN serial port to trigger an infinite loop and cause a denial of service.
This issue occurs because write-room reporting can indicate available space while write operations return zero when the transmit buffer is NULL, which can lead to a system hang.
How to mitigate CVE-2026-23472
Install security update from vendor's repository.