Critical Memory Management Vulnerability in linux-lts and xen Packages
Summary
ALPINE-CVE-2020-29568: An issue was discovered in Xen through 4.14.x. Affects linux-lts versions < 5.10.4-r0. Fixed in 5.10.4-r0. How to fix ↓
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Background
The linux-lts package provides a long-term support version of the Linux kernel, ensuring stability and security for various applications. The xen package is a hypervisor that allows multiple operating systems to run on a single physical machine. Both packages are essential for system performance and virtualization, but they are susceptible to a critical vulnerability that can lead to denial of service and system instability.
Vulnerability Detail
An issue was discovered in Xen through version 4.14.x, where certain operating systems (Linux, FreeBSD, and NetBSD) process watch events using a single thread. If these events are received faster than the thread can handle, they become queued in an unbounded manner. This can lead to an out-of-memory (OOM) condition in the backend, potentially causing system crashes or instability. The vulnerability is identified as CVE-2020-29568 and has a CVSS score of 6.5, indicating a medium severity level.
How To Fix
Minimum fixed version
5.10.4-r0
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
Currently, there are no specific workarounds mentioned for this vulnerability. However, limiting the number of events processed or optimizing the event handling thread may help mitigate the impact until a patch is applied.
Conclusion
The vulnerability CVE-2020-29568 poses a significant risk to systems using the linux-lts and xen packages in Alpine Linux. It is essential to update to the patched version to mitigate potential impacts. Users should remain vigilant and utilize tools like Vulert to monitor for vulnerabilities in their applications.
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FAQ
CVE-2020-29568 is a vulnerability in the Xen hypervisor that can lead to an out-of-memory condition due to unbounded event processing.
The linux-lts and xen packages in Alpine Linux versions v3.13 to v3.22 are affected by this vulnerability.
You can use the Vulert playground at Vulert Scanner to check if your application is affected by this vulnerability without needing to sign up.
The vulnerability has a CVSS score of 6.5, indicating a medium severity level that requires prompt attention.
If an immediate update is not possible, consider optimizing your event handling to reduce the risk of triggering the vulnerability until a patch can be applied.
References
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