Information Disclosure Risk in Intel Microcode for Debian Systems
Summary
CVE-2025-24495: Incorrect initialization of resource in the branch prediction unit for some Intel(R) Core™ Ultra Processors may allow an authenticated user to potentially enable information disclosure via local access. Affects intel-ucode versions < 20250512-r0. Fixed in 20250512-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 firmware, enhancing performance and security. It plays a vital role in ensuring the stability and efficiency of Intel CPUs across various Debian versions. However, vulnerabilities in microcode can lead to significant security risks, including potential information disclosure.
Vulnerability Detail
CVE-2025-24495 arises from incorrect initialization of resources in the branch prediction unit of some Intel(R) Core™ Ultra Processors. This flaw may allow an authenticated user to exploit the vulnerability, potentially leading to information disclosure through local access. The issue is rooted in the microcode's handling of branch predictions, which can inadvertently expose sensitive information.
How To Fix
Minimum fixed version
20250512-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 local access to systems running vulnerable Intel processors, thereby reducing the risk of exploitation until a patch is applied.
Conclusion
CVE-2025-24495 presents a serious risk of information disclosure for users of Intel Microcode on Debian systems. It is crucial to apply the necessary updates to mitigate this vulnerability and ensure system security. Users are encouraged to monitor their systems and apply patches promptly.
See every vulnerability recorded for intel-ucode →
FAQ
CVE-2025-24495 is a vulnerability in Intel Microcode that allows potential information disclosure due to incorrect resource initialization in the branch prediction unit.
Users of Intel(R) Core™ Ultra Processors running Debian 11, 12, or 13 are affected by this vulnerability.
You can use Vulert's playground at Vulert Scanner to check if your application is affected by this vulnerability without requiring any signup.
If immediate updates are not possible, consider restricting local access to your systems to mitigate the risk of exploitation.
Additional details can be found in the official CVE database or through the Intel security advisories related to microcode updates.
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