Escalation of Privilege Vulnerability in Intel Microcode Packages
Summary
CVE-2025-22840: Sequence of processor instructions leads to unexpected behavior for some Intel(R) Xeon(R) 6 Scalable processors may allow an authenticated user to potentially enable escalation of privilege via local 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 of Intel processors that provides updates to the processor's internal control logic. It is essential for maintaining system stability and security. The vulnerability identified as CVE-2025-22840 affects multiple versions of the Intel Microcode package across various Debian releases, potentially allowing an authenticated user to escalate privileges through local access.
Vulnerability Detail
The vulnerability arises from a sequence of processor instructions that can lead to unexpected behavior in certain Intel(R) Xeon(R) 6 Scalable processors. This flaw may allow an authenticated user to escalate their privileges, posing a significant security risk. The issue is rooted in the microcode's handling of specific instruction sequences, which could be exploited under certain conditions, leading to unauthorized access to system resources.
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 measure, users can limit access to the affected systems to trusted users only. Additionally, disabling certain features of the processor that may be exploited could help reduce the risk until a patch is applied.
Conclusion
CVE-2025-22840 represents a significant security risk for systems using Intel Microcode on Debian platforms. Users are strongly encouraged to update their packages promptly to protect against potential privilege escalation attacks. Utilizing tools like Vulert can help monitor and alert for such vulnerabilities in real-time.
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FAQ
CVE-2025-22840 is a vulnerability affecting Intel Microcode that may allow an authenticated user to escalate privileges on systems using certain Intel Xeon processors.
You can use the Vulert playground at Vulert Scanner to check if your application is affected by this vulnerability without needing to sign up.
If exploited, this vulnerability could allow unauthorized users to gain elevated privileges, potentially leading to data breaches or system compromise.
Yes, users are advised to update their Intel Microcode package to the latest version available in their Debian repositories to mitigate this vulnerability.
If you cannot apply the patch immediately, consider restricting access to the affected systems and disabling features that may be exploited until the patch can be applied.
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