CVE-2025-58145: 
Linux Debian vulnerability analysis and mitigation

CVE-2025-58145 is a security vulnerability in Xen hypervisor that affects the mapping of pages belonging to other domains. The vulnerability was discovered by Jan Beulich of SUSE and was publicly disclosed on September 9, 2025. The issue occurs when the P2M lock isn't held until a page reference is obtained, allowing pages to change type and ownership between domains, thus potentially violating domain boundaries. This vulnerability affects Xen versions 4.12 and onwards, specifically on Arm systems, while x86 systems are not affected (Xen Advisory).

The vulnerability stems from a locking mechanism issue where the P2M (Physical to Machine) lock is not properly maintained during page reference operations. Specifically, the lock isn't held until a page reference is obtained or fails, which can lead to unauthorized changes in page type and ownership between domains. This vulnerability is tracked as XSA-473 along with CVE-2025-58144, though they represent different issues (Xen Advisory).

An unprivileged guest can potentially cause a hypervisor crash, resulting in a Denial of Service (DoS) affecting the entire host system. Additionally, the security advisory indicates that privilege escalation and information leaks cannot be ruled out as potential impacts (Xen Advisory).

There is no known mitigation for this vulnerability other than applying the provided patches. The Xen Project has released patches (xsa473-1.patch, xsa473-2.patch, xsa473-4.18-1.patch, xsa473-4.18-2.patch) that resolve the issue. System administrators are encouraged to update to the tip of the stable branch before applying these patches (Xen Advisory).