Critical Vulnerability in Linux Kernel: Duplicate Expired Entries in Netfilter
Summary
DEBIAN-CVE-2023-52925: In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_tables: don't fail inserts if duplicate has expired nftables selftests fail: run-tests.sh testcases/sets/0044interval_overlap_0 Expected:... Affects linux versions < 6.4.13-1. Fixed in 6.4.13-1. How to fix ↓
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Background
The Linux kernel is a core component of the operating system that manages hardware and system resources. It provides essential functionalities such as process management, memory management, and device control. The kernel is crucial for system stability and performance. This vulnerability specifically affects the netfilter subsystem, which is responsible for packet filtering, network address translation, and other networking-related tasks. The issue arises from improper handling of duplicate entries that have expired, potentially leading to unexpected behavior in network operations.
Vulnerability Detail
In the Linux kernel, a vulnerability has been identified in the netfilter subsystem related to the nf_tables feature. The issue occurs when the system fails to ignore duplicate entries that have expired during insertion operations. This can lead to inconsistencies in the expected behavior of nftables self-tests, where expired elements should be skipped. The improper handling of these expired entries can result in failed test cases and may affect the overall integrity of network operations. The vulnerability is rooted in the nft_pipapo_activate function, which inconsistently fetches current elements compared to other set implementations, leading to potential errors in element management.
How To Fix
Minimum fixed version
6.4.13-1
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 recommended to apply the patch as soon as it is available to mitigate potential risks.
Conclusion
The vulnerability in the Linux kernel related to the netfilter subsystem poses significant risks due to improper handling of expired duplicate entries. Users are advised to update their kernel to the patched version 6.4.13-1 to mitigate these risks. Regular monitoring and prompt updates are essential for maintaining system security.
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FAQ
The vulnerability involves the failure to ignore expired duplicate entries in the netfilter subsystem of the Linux kernel, which can lead to inconsistencies in network operations.
You can use Vulert, which monitors open-source vulnerabilities in your software. By using the Vulert playground, you can check if your application is affected without any signup.
If exploited, this vulnerability could lead to unexpected behavior in network operations, potentially affecting system stability and security.
Yes, a patch is available in version 6.4.13-1 of the Linux kernel for both Debian 13 and 14.
While there are no specific workarounds, it is crucial to prioritize updating your kernel to the patched version to ensure system security.
References
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