Critical Vulnerability in linux-lts Package: Null Dereference in Xen's Virtual Network Protocol
Summary
ALPINE-CVE-2023-46838: Transmit requests in Xen's virtual network protocol can consist of multiple parts. Affects linux-lts versions < 5.15.147-r1. Fixed in 5.15.147-r1. How to fix ↓
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Background
The linux-lts package is a long-term support version of the Linux kernel, designed to provide stability and security for systems that require a reliable operating environment. It is widely used in various distributions, including Alpine Linux, to ensure that users receive essential updates and support for an extended period. This package is crucial for maintaining system performance and security, but it is currently affected by a vulnerability that could lead to severe consequences if not addressed.
Vulnerability Detail
The vulnerability identified as CVE-2023-46838 arises from the handling of requests in Xen's virtual network protocol, which can consist of multiple parts, some of which may be zero-length. This can lead to a NULL dereference in the core networking code when all parts of a specific SKB (Socket Buffer) are of zero length. The ramifications of this vulnerability include potential system crashes and denial of service, as the networking stack may become unstable when processing such requests.
How To Fix
Minimum fixed version
5.15.147-r1
This is the first release that contains the fix.
sudo apk add --upgrade linux-ltsTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
As a temporary workaround, users can limit the use of Xen's virtual network protocol or avoid configurations that may lead to zero-length request parts until the package is updated.
Conclusion
In summary, CVE-2023-46838 is a critical vulnerability affecting the linux-lts package, which can lead to significant system instability. It is crucial for users to update their packages to the latest versions to mitigate the risks associated with this vulnerability. Utilizing tools like Vulert can help monitor and alert for such vulnerabilities in real-time.
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FAQ
CVE-2023-46838 is a vulnerability in the linux-lts package that can lead to a NULL dereference in the core networking code due to the handling of zero-length request parts in Xen's virtual network protocol.
The vulnerability can cause system crashes and denial of service, affecting the stability and reliability of systems using the linux-lts package.
You can use Vulert's playground at Vulert Scanner to check if your application is affected by this vulnerability without needing to sign up.
The affected versions include linux-lts in Alpine v3.16, v3.17, and v3.18, with specific patched versions available for each.
You can update the linux-lts package by running the command 'apk upgrade linux-lts' in your terminal, ensuring you have the latest patched version.
References
Related vulnerabilities
Recent vulnerabilities recorded for linux-lts.
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