Critical NULL Pointer Dereference in Linux Kernel - CVE-2023-53366
Summary
CVE-2023-53366: In the Linux kernel, the following vulnerability has been resolved: block: be a bit more careful in checking for NULL bdev while polling Wei reports a crash with an application using polled IO: PGD 14265e067 P4D 14265e06... Affects linux versions < 6.1.20-1. Fixed in 6.1.20-1. How to fix ↓
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Background
The Linux kernel is the core component of many operating systems, responsible for managing hardware resources and providing essential services to software applications. It is known for its stability, performance, and flexibility, making it a popular choice for servers, desktops, and embedded systems. However, vulnerabilities can arise, such as CVE-2023-53366, which affects the kernel's handling of polled I/O operations, potentially leading to system crashes.
Vulnerability Detail
CVE-2023-53366 is a vulnerability in the Linux kernel that occurs when the kernel fails to properly check for a NULL pointer in the bio structure during polled I/O operations. This oversight can lead to a crash if two tasks are sharing a poll queue and one task completes I/O for another, resulting in a NULL dereference. The vulnerability can be exploited in scenarios where applications rely on polled I/O, potentially causing system instability and data loss.
How To Fix
Minimum fixed version
6.1.20-1
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
As a temporary workaround, consider avoiding the use of polled I/O operations in applications that may be affected by this vulnerability until the package is updated. Additionally, monitor your system for any unusual behavior that may indicate a crash due to this issue.
Conclusion
CVE-2023-53366 is a critical vulnerability in the Linux kernel that can lead to system crashes due to improper NULL pointer checks during polled I/O operations. Users are advised to update their systems to the patched version to mitigate risks. For those unable to update immediately, temporary workarounds are available.
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FAQ
CVE-2023-53366 is a vulnerability in the Linux kernel that can cause system crashes due to improper handling of NULL pointers during polled I/O operations.
You can use tools like Vulert to monitor and alert for open-source vulnerabilities in your software. Visit Vulert Scanner to check if your application is affected without requiring any signup.
Exploitation of this vulnerability can lead to system crashes, instability, and potential data loss, particularly in applications that utilize polled I/O.
Yes, a patch is available in the form of the Linux package version 6.1.20-1 for Debian 12, 13, and 14. Updating to this version will resolve the vulnerability.
If immediate updating is not possible, consider avoiding polled I/O operations in affected applications and monitor your system for any signs of instability.
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