Critical Out-of-Bounds Loop Issue in Linux Kernel: CVE-2025-21668
Summary
CVE-2025-21668: In the Linux kernel, the following vulnerability has been resolved: pmdomain: imx8mp-blk-ctrl: add missing loop break condition Currently imx8mp_blk_ctrl_remove() will continue the for loop until an out-of-bounds excepti... Affects linux versions < 6.1.128-1. Fixed in 6.1.128-1. How to fix ↓
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Background
The Linux kernel is the core component of many operating systems, providing the essential interface between hardware and software. It is known for its stability, performance, and support for a wide range of hardware architectures. However, like any complex software, it is susceptible to vulnerabilities. CVE-2025-21668 specifically affects the imx8mp_blk_ctrl_remove function, which is part of the power management domain handling in the kernel, leading to potential system crashes due to an out-of-bounds exception.
Vulnerability Detail
CVE-2025-21668 arises from a missing loop break condition in the imx8mp_blk_ctrl_remove function. This oversight allows the function to continue iterating beyond the bounds of an array, potentially leading to an out-of-bounds exception. The ramifications of this vulnerability include system instability and crashes, which can disrupt services and compromise the reliability of systems relying on the affected kernel versions. The technical details indicate that the vulnerability can be triggered during device shutdown processes, making it critical for systems that utilize the imx8mp_blk_ctrl component.
How To Fix
Minimum fixed version
6.1.128-1
This is the first release that contains the fix.
sudo apt-get install --only-upgrade linuxTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
Currently, there are no specific workarounds mentioned for this vulnerability. However, users are advised to avoid using the affected kernel version until a patch is applied.
Conclusion
CVE-2025-21668 is a critical vulnerability in the Linux kernel that can lead to system crashes due to an out-of-bounds exception. It is essential for users to update their systems to the patched version of the kernel to ensure stability and security. Monitoring tools like Vulert can assist in identifying vulnerabilities in open-source software.
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FAQ
CVE-2025-21668 is a vulnerability in the Linux kernel that allows for an out-of-bounds exception due to a missing loop break condition in the imx8mp_blk_ctrl_remove function.
The vulnerability affects systems running the Linux kernel versions in Debian 12 and Debian 13 that utilize the imx8mp_blk_ctrl component.
You can use Vulert, which monitors and alerts for open-source vulnerabilities in your software. By using the Vulert playground, you can check if your application is affected without requiring any installation.
The potential consequences include system crashes and instability, which can disrupt services and impact the reliability of systems relying on the affected kernel.
Yes, a patch is available. Users should update their Linux kernel to the latest version to mitigate the vulnerability.
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