Vulnerability in Kernel: mld_newpack() Panic
Summary
UVI-2021-1000647: mld: fix panic in mld_newpack(). Affects Kernel versions >= 72e09ad107e78d69ff4d3b97a69f0aad2b77280f, < 4b77ad9097067b31237eeeee0bf70f80849680a0. 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 essential functionality and acts as a bridge between hardware and software. It manages system resources, facilitates communication between different software components, and ensures the overall stability and security of the system. The mld_newpack() function is a part of the Kernel's Multicast Listener Discovery (MLD) protocol implementation, which enables IPv6 hosts to join and leave multicast groups. This vulnerability in mld_newpack() can lead to a panic, causing the system to crash and potentially allowing attackers to execute arbitrary code or disrupt network communication.
Vulnerability Detail
The vulnerability, identified as UVI-2021-1000647, originates from a flaw in the mld_newpack() function within the Kernel. When certain conditions are met, this function can trigger a panic, resulting in a system crash. Although the exact impact and attack vectors have not been proven, it is crucial to address this vulnerability promptly to mitigate potential risks. The vulnerability was introduced in Kernel version 2.6.35 and has been fixed in version 4.19.193.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As a workaround, users can consider disabling the MLD protocol or implementing network-level mitigations to minimize the risk associated with this vulnerability. However, it is important to note that these workarounds may impact the functionality and performance of IPv6 multicast communication. Therefore, updating the Kernel to the fixed version is the recommended approach.
Conclusion
The vulnerability in the Kernel's mld_newpack() function poses a risk of system crashes and potential exploitation. It is crucial to update the Linux Kernel to version 4.19.193 or later to mitigate this vulnerability. Disabling the MLD protocol or implementing network-level mitigations can serve as temporary workarounds, but updating the Kernel is the recommended solution. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
The Kernel is a critical component of the Linux operating system that manages system resources, facilitates communication between software components, and ensures system stability and security.
The mld_newpack() function is part of the Kernel's Multicast Listener Discovery (MLD) protocol implementation, which allows IPv6 hosts to join and leave multicast groups.
This vulnerability can lead to a system crash (panic) and potentially allow attackers to execute arbitrary code or disrupt network communication.
To fix this vulnerability, it is recommended to update the Linux Kernel to version 4.19.193 or later, which includes the necessary patch to address the flaw in the mld_newpack() function.
As a workaround, users can consider disabling the MLD protocol or implementing network-level mitigations. However, these workarounds may impact IPv6 multicast communication functionality and performance.
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