Critical Null Pointer Dereference Vulnerability in Linux Kernel (CVE-2025-38630)
Summary
CVE-2025-38630: In the Linux kernel, the following vulnerability has been resolved: fbdev: imxfb: Check fb_add_videomode to prevent null-ptr-deref fb_add_videomode() can fail with -ENOMEM when its internal kmalloc() cannot allocate a st... Affects linux versions 5.10.103-1 – 6.9.9-1. No fix is published. How to fix ↓
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Background
The Linux kernel is the core component of the Linux operating system, responsible for managing hardware resources and providing essential services to software applications. It is widely used in various environments, from servers to embedded systems. The kernel's fbdev subsystem, which handles framebuffer devices, is crucial for rendering graphics. This vulnerability affects the fbdev subsystem, specifically the imxfb driver, which can lead to system instability if not addressed.
Vulnerability Detail
In the Linux kernel, a vulnerability has been identified in the fbdev subsystem related to the imxfb driver. The function fb_add_videomode() can fail with an -ENOMEM error when it cannot allocate memory for a struct fb_modelist. If this occurs, the modelist remains empty, yet the driver continues to register, potentially leading to a null pointer dereference. This issue is similar to a previous commit aimed at preventing null pointer dereferences in framebuffer operations. The ramifications of this vulnerability include system crashes and instability, making it critical to address.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
Currently, there are no specific workarounds mentioned for this vulnerability. It is recommended to apply the patch as soon as it is available to mitigate potential risks.
Conclusion
The CVE-2025-38630 vulnerability poses a significant risk to systems running affected versions of the Linux kernel. It is essential to apply the available patch to ensure system stability and security. Regular monitoring and updates are crucial for maintaining the integrity of your software environment.
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FAQ
CVE-2025-38630 is a vulnerability in the Linux kernel's fbdev subsystem that can lead to a null pointer dereference, potentially causing system crashes.
If exploited, this vulnerability can lead to instability and crashes in systems using the affected Linux kernel versions.
To check if your application is affected by this vulnerability, you can use Vulert, which monitors and alerts for open-source vulnerabilities in real-time.
The best way to protect your system is to update the Linux package to the patched version 6.16.3-1 or later.
More information can be found in the official CVE database and through security advisories related to the Linux kernel.
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