Critical Backtracking Bug in Linux Kernel BPF - CVE-2023-52928
Summary
CVE-2023-52928: In the Linux kernel, the following vulnerability has been resolved: bpf: Skip invalid kfunc call in backtrack_insn The verifier skips invalid kfunc call in check_kfunc_call(), which would be captured in fixup_kfunc_call(... Affects linux versions < 6.1.11-1. Fixed in 6.1.11-1. How to fix ↓
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Background
The Linux kernel is the core component of many operating systems, providing essential services for all other parts of the system. It manages hardware resources, system calls, and provides a platform for applications. The kernel's BPF (Berkeley Packet Filter) subsystem is crucial for network packet filtering and monitoring. However, a recent vulnerability has been identified that affects the BPF verifier, potentially leading to system instability.
Vulnerability Detail
CVE-2023-52928 is a vulnerability in the Linux kernel's BPF verifier, specifically related to the handling of invalid kfunc calls during backtracking. The issue arises when the verifier skips invalid calls in the check_kfunc_call() function, which can lead to warnings and potential system crashes. The backtrack_insn() function may trigger a verifier backtracking bug, resulting in a warning that indicates a failure in the kernel's ability to properly manage instruction backtracking. This vulnerability could be exploited to cause unexpected behavior in the kernel, impacting system reliability and security.
How To Fix
Minimum fixed version
6.1.11-1
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. It is advisable to apply the patch as soon as it is available to mitigate any risks associated with this issue.
Conclusion
CVE-2023-52928 is a critical vulnerability in the Linux kernel's BPF verifier that can lead to system instability. It is essential to update your Linux package to the patched version to mitigate the risks associated with this vulnerability. Regular monitoring and prompt updates are key to maintaining system security.
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FAQ
CVE-2023-52928 is a vulnerability in the Linux kernel's BPF verifier that can lead to system instability due to improper handling of invalid kfunc calls.
This vulnerability can cause unexpected behavior in the kernel, potentially leading to system crashes or instability.
Yes, a patch is available in version 6.1.11-1 or later of the Linux package. It is recommended to update your system to this version.
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 by CVE-2023-52928 without any signup.
While there are no specific workarounds, it is crucial to monitor your system for any unusual behavior and plan to apply the patch as soon as possible.
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