netfilter: nftables: Fix a memleak from userdata error path in new objects
Summary
UVI-2021-1000327: netfilter: nftables: Fix a memleak from userdata error path in new objects. Affects Kernel versions >= b131c96496b369c7b14125e7c50e89ac7cec8051, < 2c784a500f5edd337258b0fdb2f31bc9abde1a23. No fix is published. How to fix ↓
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Background
The netfilter package is a part of the Linux Kernel ecosystem and is responsible for implementing packet filtering and network address translation (NAT) in the Linux operating system. It provides a framework for configuring firewall rules and manipulating network packets. The nftables component within netfilter is a packet filtering subsystem that replaces the older iptables framework. It allows users to define and manage firewall rules using a more flexible and efficient syntax.
Vulnerability Detail
This vulnerability in nftables results in a memory leak when encountering an error path in new objects. Specifically, when handling userdata in new objects, a memory leak occurs if an error is encountered during the process. This can lead to a gradual depletion of system memory resources, potentially causing performance degradation or denial of service (DoS) conditions. The vulnerability was introduced in version v5.10 of the Linux Kernel and has been fixed in version v5.10.38.
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 netfilter nftables vulnerability allows for a memory leak when encountering an error path in new objects. It is recommended to update the Linux Kernel to version v5.10.38 or later to mitigate this vulnerability. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
Netfilter is a packet filtering framework in the Linux Kernel that provides firewall functionality. Nftables is a component of netfilter that replaces the older iptables framework and offers a more flexible syntax for defining firewall rules.
The vulnerability can result in a memory leak, leading to a gradual depletion of system memory resources. This can cause performance degradation or denial of service (DoS) conditions.
To fix this vulnerability, update the Linux Kernel to version v5.10.38 or later. Obtain the updated kernel source code and compile it for your system, or wait for your Linux distribution to provide an updated package.
No specific workaround has been mentioned for this vulnerability.
For more information, refer to the vulnerability details in the Open Source Vulnerability database: https://github.com/cloudsecurityalliance/gsd-database/blob/main/2021/1000xxx/UVI-2021-1000327.json
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