This vulnerability involves udev in systemd versions prior to 260, where local root execution can be achieved by leveraging malicious hardware devices combined with unsanitized kernel output. The affected products include Microsoft Azure Linux and CBL Mariner 2.0 and 3.0. The vulnerability is tracked as CVE-2026-40225 by the Microsoft Security Response Center. No CVSS score or detailed vendor advisory information is available to confirm patch status or exploitation details.

Successful exploitation of this vulnerability could allow a local attacker to gain root privileges on affected systems by exploiting the way udev handles hardware devices and kernel output. This elevates the attacker's privileges to the highest level on the system, potentially compromising system integrity and security. However, no known exploits in the wild have been reported to date.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, restrict local access to trusted users only and monitor for suspicious activity related to hardware device interactions. Avoid connecting untrusted hardware devices to affected systems.