Critical Out-of-Bounds Write Vulnerability in Intel Microcode Package
Summary
ALPINE-CVE-2025-26403: Out-of-bounds write in the memory subsystem for some Intel(R) Xeon(R) 6 processors when using Intel(R) SGX or Intel(R) TDX may allow a privileged 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
The intel-ucode package provides microcode updates for Intel processors, enhancing system stability and performance. It is crucial for systems utilizing Intel Xeon processors, especially in environments requiring secure computing, such as those using Intel SGX or TDX technologies. This package is vital for maintaining optimal processor functionality and security.
Vulnerability Detail
The vulnerability identified as ALPINE-CVE-2025-26403 is an out-of-bounds write issue in the memory subsystem affecting certain Intel Xeon 6 processors. This flaw allows a privileged user to potentially escalate privileges through local access, posing significant security risks. The vulnerability arises from improper memory handling, which can lead to unauthorized access and manipulation of 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, consider restricting access to the affected systems to trusted users only, and monitor for any unusual activity that may indicate exploitation attempts.
Conclusion
The ALPINE-CVE-2025-26403 vulnerability poses a serious risk to systems using the intel-ucode package on specific Intel processors. Immediate action is recommended to update the package to the patched version to mitigate potential security threats.
See every vulnerability recorded for intel-ucode →
FAQ
It is an out-of-bounds write vulnerability that can allow privilege escalation for local users.
The vulnerability affects some Intel Xeon 6 processors that utilize Intel SGX or TDX.
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 an immediate update is not possible, limit access to the affected systems and monitor for suspicious activities.
Detailed information can be found in the CVE database and through the Alpine Linux security advisories.
References
Related vulnerabilities
Recent vulnerabilities recorded for intel-ucode.
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