net/sched: sch_taprio: properly cancel timer from taprio_destroy() - Kernel
Summary
GSD-2021-1001627: net/sched: sch_taprio: properly cancel timer from taprio_destroy(). Affects Kernel versions >= a969a632cbe7165d448a5528806ad120c2599397, < 3ec73ffeef54596c32aff0e73fe60971b9c8b866. No fix is published. How to fix ↓
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Background
The Kernel is a critical component of the Linux operating system that provides core functionality and manages system resources. It includes various subsystems, including the network scheduler (net/sched), which handles packet scheduling and traffic control. One of the components in net/sched is sch_taprio, which implements the Time-Aware Priority (TAP) scheduling algorithm. This algorithm is used to prioritize network traffic based on time-sensitive requirements. However, a vulnerability has been discovered in sch_taprio that can lead to a timer not being properly canceled when the taprio_destroy() function is called.
Vulnerability Detail
The vulnerability in sch_taprio arises from a failure to cancel a timer during the taprio_destroy() function. This can result in the timer continuing to run even after the sch_taprio instance has been destroyed. An attacker who can trigger the destruction of a sch_taprio instance could potentially exploit this vulnerability to execute arbitrary code or disrupt network traffic. The impact and attack plausibility of this vulnerability have not been proven yet. The vulnerability was introduced in Linux Kernel version v5.10.5 and has been fixed in version v5.10.73.
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
In conclusion, the sch_taprio component in the Linux Kernel is vulnerable to a timer cancellation issue during the taprio_destroy() function. This vulnerability can potentially be exploited to execute arbitrary code or disrupt network traffic. It is recommended to update the Linux Kernel to version v5.10.73 or later to fix this vulnerability. For further support on vulnerability remediation, you can reach out to DevNack.com.
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FAQ
The impact of this vulnerability is not yet proven. However, if successfully exploited, an attacker could execute arbitrary code or disrupt network traffic.
You can use Vulert's playground (https://vulert.com/scanner) to check if your system is affected by this vulnerability. Vulert monitors and alerts in real-time for open-source vulnerabilities without requiring access to the code or installation.
There is no known exploit for this vulnerability at the moment. However, it is important to apply the recommended fix to mitigate any potential risks.
The recommended approach to mitigate this vulnerability is to update the Linux Kernel to the fixed version. Applying the fix ensures that the timer is properly canceled in the taprio_destroy() function.
You can find more information about this vulnerability in the GSD database maintained by the Cloud Security Alliance. Here is the link to the vulnerability details: https://github.com/cloudsecurityalliance/gsd-database/blob/main/2021/1001xxx/GSD-2021-1001627.json
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