net/sched: sch_ets: don't remove idle classes from the round-robin list
Summary
GSD-2021-1002742: net/sched: sch_ets: don't remove idle classes from the round-robin list. Affects Kernel versions >= e25bdbc7e951ae5728fee1f4c09485df113d013c, < 491c1253441e2fdc8f6a6f4976e3f13440419b7a. No fix is published. How to fix ↓
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Background
The Kernel package is a critical component of the Linux operating system. It provides the core functionality and interfaces for the system's hardware, software, and processes. The sch_ets module within the Kernel is responsible for managing the Enhanced Transmission Selection (ETS) algorithm for network traffic scheduling. This algorithm assigns different priorities to network traffic classes to ensure fair and efficient utilization of network resources.
Vulnerability Detail
The sch_ets module in the Kernel has a vulnerability that allows idle classes to be removed from the round-robin list. This can lead to a denial-of-service (DoS) condition where idle classes are not properly handled, causing network traffic to be incorrectly prioritized. An attacker could exploit this vulnerability to disrupt network traffic and potentially impact the availability and performance of affected systems.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
There is no specific workaround mentioned for this vulnerability.
Conclusion
The sch_ets module in the Kernel has a vulnerability that allows idle classes to be removed from the round-robin list, potentially leading to a denial-of-service (DoS) condition. It is recommended to update the Linux Kernel to version v5.15.11 or later to fix this vulnerability. For further support and assistance with vulnerability remediation, please contact DevNack.com.
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FAQ
This vulnerability can lead to a denial-of-service (DoS) condition where network traffic is incorrectly prioritized, potentially impacting the availability and performance of affected systems.
You can use Vulert's playground (https://vulert.com/scanner) to check if your system is affected by this vulnerability. Vulert analyzes the manifest file (e.g., package-lock.json) of your application and provides real-time alerts for open-source vulnerabilities, including this one.
Yes, a patch is available in the Linux Kernel version v5.15.11. It is recommended to update to this version or later to fix the vulnerability.
There are no known exploits for this vulnerability at the time of this report. However, it is important to apply the patch or update as soon as possible to mitigate the risk.
You can find more information about this vulnerability in the GSD-2021-1002742 entry of the GSD database maintained by the Cloud Security Alliance. The source link is available here: https://github.com/cloudsecurityalliance/gsd-database/blob/main/2021/1002xxx/GSD-2021-1002742.json
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