Kernel Panic Vulnerability in Linux Packages: CVE-2023-52476
Summary
CVE-2023-52476: In the Linux kernel, the following vulnerability has been resolved: perf/x86/lbr: Filter vsyscall addresses We found that a panic can occur when a vsyscall is made while LBR sampling is active. 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 Linux operating systems, responsible for managing hardware resources and providing essential services to applications. It is known for its stability, performance, and flexibility. However, vulnerabilities can arise, such as CVE-2023-52476, which affects various Debian versions of the Linux package. This vulnerability can lead to kernel panics when certain system calls are made, particularly involving vsyscalls.
Vulnerability Detail
CVE-2023-52476 is a vulnerability in the Linux kernel that occurs when a vsyscall is made while LBR (Last Branch Record) sampling is active. If the vsyscall is interrupted by a non-maskable interrupt (NMI) for performance sampling, it can lead to a sequence of function calls that ultimately results in an unhandled page fault. This fault occurs because the kernel attempts to access an invalid memory address in the vsyscall region, potentially causing a system crash or panic.
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. The best course of action is to apply the necessary updates as soon as they are available.
Conclusion
CVE-2023-52476 is a significant vulnerability in the Linux kernel that can lead to system crashes under specific conditions. Users are urged to update their systems promptly to the fixed versions to ensure stability and security. Utilizing tools like Vulert can help monitor for such vulnerabilities effectively.
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FAQ
CVE-2023-52476 is a vulnerability in the Linux kernel that can cause kernel panics when certain system calls are made while LBR sampling is active.
The vulnerability affects Linux packages in Debian 11, 12, and 13. Specific fixed versions are available for Debian 12 (6.1.64-1) and Debian 13 (6.5.8-1).
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 needing to sign up.
If your system is affected, you should update your Linux packages to the latest versions that contain the fix for this vulnerability.
While the primary risk is a kernel panic leading to system instability, it is advisable to back up important data regularly to mitigate any potential data loss.
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