CVE-2025-1272: 
Linux Ubuntu vulnerability analysis and mitigation

A security vulnerability identified as CVE-2025-1272 affects the Linux Kernel's lockdown mode in versions 6.12 and above for Fedora Linux. The vulnerability was discovered in February 2025 and involves the lockdown mode being disabled by default without any warning. This security feature is designed to restrict access to sensitive kernel resources (Security Online).

The vulnerability has been assigned a CVSS score of 7.7. The lockdown mode is a security enhancement in the Linux kernel that controls access to critical features including kernel memory mappings, I/O ports, BPF, and kprobes. When disabled, it compromises the system's security posture by removing restrictions on these sensitive resources (Security Online).

The vulnerability exposes systems to potential attacks where malicious actors could access sensitive information such as kernel memory mappings, I/O ports, BPF, and kprobes. Furthermore, it enables the loading of unsigned modules, which can break Secure Boot protection and allow the execution of untrusted code (Security Online).

The vulnerability has been addressed in the 6.12.14 stable kernel update for Fedora Linux. Users are required to perform a system reboot after installing the update to apply the security fix. It is strongly recommended that affected users update their systems immediately to mitigate the risk (Security Online).