Critical Memory Handling Vulnerability in Linux Kernel - CVE-2025-39989
Summary
CVE-2025-39989: In the Linux kernel, the following vulnerability has been resolved: x86/mce: use is_copy_from_user() to determine copy-from-user context Patch series "mm/hwpoison: Fix regressions in memory failure handling", v4. Affects linux versions 6.1.106-1 – 6.9.9-1. No fix is published. How to fix ↓
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Background
The Linux kernel is the core component of a Linux operating system, managing hardware resources and providing essential services for software applications. It is known for its stability, performance, and security features. However, vulnerabilities can arise, such as CVE-2025-39989, which affects memory failure handling, particularly in versions 5.17 and later, leading to potential kernel panics and user process terminations.
Vulnerability Detail
CVE-2025-39989 is a critical vulnerability in the Linux kernel that affects memory failure handling. It originates from changes made in the kernel's error handling mechanisms, specifically regarding how the kernel deals with poisoned memory pages during user space operations. The vulnerability can lead to kernel panics when the kernel attempts to copy data from user space, resulting in a crash instead of a graceful error return. Additionally, it can cause user processes to be killed by SIGBUS signals due to race conditions between memory controller signals and kernel operations.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As a temporary workaround, users can avoid operations that involve copying from user space until the kernel is updated. This may involve modifying applications to handle data differently or using alternative methods for data transfer that do not trigger the vulnerability.
Conclusion
CVE-2025-39989 is a critical vulnerability in the Linux kernel that can lead to severe issues such as kernel panics and user process terminations. It is crucial for users to update their systems to patched versions of the kernel to mitigate these risks. Temporary workarounds can be employed, but the best course of action is to apply the necessary updates as soon as possible.
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FAQ
CVE-2025-39989 is a vulnerability in the Linux kernel that affects memory failure handling, potentially leading to kernel crashes and user process terminations.
The vulnerability affects Linux kernel versions 5.17 and later.
You can use Vulert to monitor and alert for open-source vulnerabilities in your software. Visit Vulert Scanner to check if your application is affected by this vulnerability without requiring any signup.
If you cannot update your kernel immediately, consider implementing workarounds such as avoiding operations that involve copying from user space.
More information can be found in the official CVE database and security advisories related to the Linux kernel.
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