net: Fix skb delta_truesize in UDP GRO frag_list
Summary
GSD-2022-1000771: net: fix up skbs delta_truesize in UDP GRO frag_list. Affects Kernel versions >= 53475c5dd856212e91538a9501162e821cc1f791, < 3a65b82b1ef28ec97233e77e93a265035f948ea5. No fix is published. How to fix ↓
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Background
The Linux Kernel is an open-source monolithic Unix-like computer operating system kernel. It provides the essential services for the operating system and allows communication between hardware and software components. The UDP (User Datagram Protocol) is a transport layer protocol used for communication over IP networks. GRO (Generic Receive Offload) is a feature in the Linux Kernel that offloads packet processing tasks from the CPU to the network interface card. This vulnerability affects the Linux Kernel and specifically impacts the handling of skbs (socket buffers) in the UDP GRO frag_list.
Vulnerability Detail
The vulnerability arises from a flaw in the handling of skbs delta_truesize in the UDP GRO frag_list. This flaw could potentially be exploited by an attacker to cause a denial-of-service (DoS) condition or execute arbitrary code. By manipulating the delta_truesize value, an attacker may be able to trigger memory corruption or overflow, leading to system instability or unauthorized access. The vulnerability was introduced in Linux Kernel version v5.11 and has been fixed in version v5.15.27 by commit 3a65b82b1ef28ec97233e77e93a265035f948ea5.
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 vulnerability in the Linux Kernel's handling of skbs delta_truesize in the UDP GRO frag_list could lead to a denial-of-service (DoS) condition or arbitrary code execution. It is crucial to update the Linux Kernel to version v5.15.27 or later to mitigate the risk. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
The vulnerability could potentially lead to a denial-of-service (DoS) condition or allow an attacker to execute arbitrary code.
You can use the Vulert Playground (https://vulert.com/scanner) to check if your system is affected by this vulnerability. Simply upload your package-lock.json file and Vulert will provide real-time alerts for open-source vulnerabilities.
Yes, the vulnerability has been fixed in Linux Kernel version v5.15.27. It is recommended to update to this version or later to mitigate the risk.
Yes, this vulnerability can potentially be exploited remotely if the affected system is exposed to malicious network traffic.
There are no known instances of this vulnerability being exploited in the wild at the time of this report.
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