Privilege Escalation Risk in Intel Microcode Packages Across Debian Versions
Summary
CVE-2025-22839: Insufficient granularity of access control in the OOB-MSM for some Intel(R) Xeon(R) 6 Scalable processors may allow a privileged user to potentially enable escalation of privilege via adjacent access. Affects intel-ucode versions < 20250812-r0. Fixed in 20250812-r0. How to fix ↓
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Background
Intel Microcode is a critical component that updates the processor's internal instructions to improve performance and security. It is essential for maintaining the stability and security of Intel processors, particularly the Xeon Scalable series. The vulnerability identified as CVE-2025-22839 affects multiple Debian versions (11, 12, 13, and 14) and poses a significant risk due to insufficient access control granularity.
Vulnerability Detail
CVE-2025-22839 arises from inadequate access control in the Out-Of-Band Management System (OOB-MSM) for certain Intel Xeon 6 Scalable processors. This vulnerability allows a privileged user to potentially escalate their privileges through adjacent access, which could lead to unauthorized actions within the system. The lack of proper access restrictions can expose sensitive operations to exploitation, making it critical for users to address this issue promptly.
How To Fix
Minimum fixed version
20250812-r0
This is the first release that contains the fix.
sudo apk add --upgrade intel-ucodeTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
As a temporary workaround, users can limit access to the affected systems and monitor for any suspicious activities. Implementing strict user permissions and minimizing the number of privileged users can help reduce the risk of exploitation until a patch is applied.
Conclusion
CVE-2025-22839 presents a significant risk to users of Intel Microcode across multiple Debian versions. It is crucial to update the affected packages to mitigate the potential for privilege escalation. By following the recommended steps and utilizing tools like Vulert, users can enhance their security posture against this vulnerability.
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FAQ
CVE-2025-22839 is a vulnerability affecting Intel Microcode in Debian systems that allows for potential privilege escalation due to insufficient access control.
Debian versions 11, 12, 13, and 14 are impacted by this vulnerability.
You can use the Vulert playground at Vulert Scanner to check if your application is affected by this vulnerability without needing to sign up.
The primary risk is the potential for a privileged user to escalate their privileges, which could lead to unauthorized access and control over the system.
It is recommended to regularly check for updates and apply them promptly to ensure your system remains secure against vulnerabilities.
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