Critical NULL Pointer Dereference in Linux Kernel - Package: linux
Summary
CVE-2023-53095: In the Linux kernel, the following vulnerability has been resolved: drm/ttm: Fix a NULL pointer dereference The LRU mechanism may look up a resource in the process of being removed from an object. Affects linux versions < 6.1.25-1. Fixed in 6.1.25-1. 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 applications. It is widely used across various platforms, including servers, desktops, and embedded systems. The kernel's stability and security are paramount, as vulnerabilities can lead to system crashes or unauthorized access.
Vulnerability Detail
The vulnerability identified as CVE-2023-53095 in the Linux kernel pertains to a NULL pointer dereference in the Direct Rendering Manager (DRM) subsystem, specifically within the TTM (Translation Table Maps) memory management. This issue arises when the LRU (Least Recently Used) mechanism attempts to access a resource that is in the process of being removed from an object. The locking rules governing resource access are ambiguous, leading to potential dereferencing of a NULL pointer, which can cause system instability or crashes. If exploited, this vulnerability could compromise the integrity of the system, making it crucial to address promptly.
How To Fix
Minimum fixed version
6.1.25-1
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, no specific workarounds are provided for this vulnerability. It is recommended to apply the patch as soon as it is available to mitigate the risk.
Conclusion
The CVE-2023-53095 vulnerability in the Linux kernel poses a significant risk due to the potential for NULL pointer dereference, leading to system instability. Users are urged to update their kernel to the patched version 6.1.25-1 to mitigate this risk. Regular monitoring and prompt updates are essential for maintaining system security.
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FAQ
CVE-2023-53095 is a vulnerability in the Linux kernel that can lead to a NULL pointer dereference, potentially causing system crashes.
You can use Vulert, which monitors open-source vulnerabilities in your software. Visit Vulert Scanner to check if your application is affected without any signup.
Exploiting this vulnerability may lead to system instability, crashes, or unauthorized access, compromising the overall security of the system.
You can update your Linux kernel by running 'sudo apt-get update && sudo apt-get upgrade linux' in the terminal, followed by a system reboot.
Currently, there are no specific workarounds available. It is advisable to apply the patch as soon as it is released.
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