Race Condition Vulnerability in Linux Kernel - DEBIAN-CVE-2023-52446
Summary
DEBIAN-CVE-2023-52446: In the Linux kernel, the following vulnerability has been resolved: bpf: Fix a race condition between btf_put() and map_free() When running ./test_progs -j in my local vm with latest kernel, I once hit a kasan error like... Affects linux versions < 6.6.15-1. Fixed in 6.6.15-1. 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. This vulnerability affects the Linux kernel versions in Debian 13 and 14, specifically in the BPF (Berkeley Packet Filter) subsystem, which is used for packet filtering and network monitoring.
Vulnerability Detail
The vulnerability identified as DEBIAN-CVE-2023-52446 is a race condition between the functions btf_put() and map_free() in the Linux kernel. This flaw can lead to a use-after-free condition, where memory that has already been freed is accessed, potentially resulting in system crashes or arbitrary code execution. The issue was observed during the execution of test programs, leading to a KASAN (Kernel Address Sanitizer) error indicating a slab-use-after-free scenario. The technical details reveal that the error occurs in the bpf_rb_root_free function, where a freed memory address is accessed, causing instability in the kernel.
How To Fix
Minimum fixed version
6.6.15-1
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. The best course of action is to apply the available patch as soon as possible.
Conclusion
The DEBIAN-CVE-2023-52446 vulnerability in the Linux kernel poses significant risks due to a race condition that can lead to use-after-free errors. Users are strongly advised to update their systems to the patched version 6.6.15-1 to ensure protection against potential exploits. Regular monitoring for vulnerabilities using tools like Vulert can help maintain system security.
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FAQ
It is a vulnerability in the Linux kernel that causes a race condition leading to a use-after-free error.
If exploited, this vulnerability could lead to system crashes or allow attackers to execute arbitrary code.
The vulnerability affects Linux kernel versions in Debian 13 and 14 prior to version 6.6.15-1.
You can use Vulert, which monitors open-source vulnerabilities in real-time. Check your application using the Vulert playground at Vulert Scanner.
While there are no specific workarounds, it is crucial to prioritize updating the package to mitigate the risk associated with this vulnerability.
References
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