Critical Vulnerability in Xen Package: NULL Pointer Dereference and Memory Handling Issues
Summary
CVE-2025-58142: [This CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.] There are multiple issues related to the handling and accessing of guest memory pages in th... Affects xen versions < 4.18.5-r2. Fixed in 4.18.5-r2. How to fix ↓
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Background
Xen is an open-source hypervisor that enables multiple operating systems to run concurrently on a single physical machine. It is widely used for virtualization in cloud computing and server environments. The Xen package is crucial for managing guest operating systems and their interactions with hardware. However, recent vulnerabilities have been identified that compromise its stability and security, particularly in the handling of guest memory pages.
Vulnerability Detail
The vulnerability, identified as CVE-2025-58142, arises from a NULL pointer dereference when the system assumes that the SIM page is mapped during the delivery of synthetic timer messages. This flaw can lead to system crashes or unexpected behavior, potentially allowing attackers to exploit the hypervisor and gain unauthorized access to guest operating systems. The vulnerability is part of a series of issues related to memory management in the viridian code, which also includes CVE-2025-27466 and CVE-2025-58143.
How To Fix
Minimum fixed version
4.18.5-r2
This is the first release that contains the fix.
sudo apk add --upgrade xenTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
As a temporary workaround, users are advised to ensure that the SIM page is correctly mapped before delivering synthetic timer messages. However, this is not a permanent fix and should not replace updating to the patched version.
Conclusion
The CVE-2025-58142 vulnerability in the Xen package poses significant risks to system stability and security. Users are strongly encouraged to update their packages to the latest patched versions to protect against potential exploits. Utilizing tools like Vulert can help monitor and alert for such vulnerabilities in real-time.
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FAQ
CVE-2025-58142 is a vulnerability in the Xen hypervisor that results from a NULL pointer dereference, which can lead to system crashes or unauthorized access.
You can use Vulert's playground at Vulert Scanner to check if your application is affected by this vulnerability without any signup.
The consequences include potential system instability, crashes, and the risk of unauthorized access to guest operating systems.
Yes, patches are available for various versions of the Xen package. Users should update to the specified fixed versions to mitigate the vulnerability.
If you cannot update, consider implementing the temporary workaround of ensuring the SIM page is mapped correctly, but prioritize updating as soon as possible.
References
Related vulnerabilities
Recent vulnerabilities recorded for xen.
