net/sched: sch_frag: fix stack OOB read while fragmenting IPv4 packets in Kernel
Summary
GSD-2021-1000109: net/sched: sch_frag: fix stack OOB read while fragmenting IPv4 packets. Affects Kernel versions >= c129412f74e99b609f0a8e95fc3915af1fd40f34, < 018bb8da5b5888e19585f9b802f036afe643fcef. No fix is published. How to fix ↓
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Background
The Kernel is a crucial component of the Linux operating system that provides core functionalities and acts as an interface between hardware and software. It manages system resources, facilitates communication between processes, and ensures security and stability. The sch_frag module within the Kernel is responsible for fragmenting IPv4 packets to accommodate network transmission. However, a vulnerability has been discovered in this module that allows for a stack out-of-bounds read during the fragmentation process.
Vulnerability Detail
The vulnerability in the sch_frag module of the Kernel arises from a stack out-of-bounds read while fragmenting IPv4 packets. An attacker could exploit this flaw to read sensitive information from the stack memory, potentially leading to unauthorized access or information disclosure. The impact and attack plausibility of this vulnerability have not been proven yet. The vulnerability was introduced in version v5.11 of the Linux Kernel and has been fixed in version v5.11.20 by commit 018bb8da5b5888e19585f9b802f036afe643fcef.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
No specific workaround has been mentioned for this vulnerability.
Conclusion
The sch_frag module in the Kernel is vulnerable to a stack out-of-bounds read while fragmenting IPv4 packets. This vulnerability can potentially lead to unauthorized access or information disclosure. It is crucial to update the Linux Kernel to version v5.11.20 or later to mitigate this vulnerability. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
The impact of this vulnerability is not yet proven. However, if successfully exploited, it could lead to unauthorized access or information disclosure.
You can use Vulert's playground at Vulert Scanner to check if your system is affected by this vulnerability. Simply upload your package-lock.json file, and Vulert will analyze it in real-time to identify any open-source vulnerabilities, including this one.
Yes, a patch has been released to fix this vulnerability. It is recommended to update the Linux Kernel to version v5.11.20 or later.
There are currently no known exploits for this vulnerability. However, it is important to apply the patch and keep the Kernel updated to mitigate any potential risks.
You can find more information about this vulnerability in the GSD-2021-1000109 entry of the GSD database maintained by the Cloud Security Alliance. The link to the specific entry is available in the references section.
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