Vulnerability in Kernel: Illegal APIC Register Access
Summary
GSD-2021-1000913: kvm: LAPIC: Restore guard to prevent illegal APIC register access. Affects Kernel versions >= 01402cf81051f796dac7c60ca11d6147153ca46a, < bf99ea52970caeb4583bdba1192c1f9b53b12c84. 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 acts as an interface between hardware and software. It manages system resources, facilitates communication between processes, and handles device drivers. The Kernel is responsible for maintaining the security and stability of the system. However, a vulnerability has been discovered in the Kernel that allows for illegal access to the Advanced Programmable Interrupt Controller (APIC) registers.
Vulnerability Detail
The vulnerability in the Kernel allows an attacker to gain unauthorized access to the APIC registers, which control interrupt handling and communication between processors. By exploiting this vulnerability, an attacker could potentially manipulate the APIC registers, leading to various security issues such as privilege escalation, denial of service, or information disclosure. The vulnerability was introduced in version v5.3 of the Linux Kernel and was fixed in version v5.4.128.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
If updating the Kernel is not immediately feasible, a possible workaround is to implement strict access controls and monitoring mechanisms for the APIC registers. This can help mitigate the risk of unauthorized access and manipulation. However, this workaround is not a permanent solution and should be considered temporary until the Kernel is updated.
Conclusion
The vulnerability in the Kernel that allows for illegal APIC register access poses a significant security risk. It is crucial to update the Linux Kernel to version v5.4.128 or later to mitigate this vulnerability. Implementing strict access controls and monitoring mechanisms for the APIC registers can serve as a temporary workaround until the update is applied. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
The vulnerability allows for unauthorized access to the APIC registers, which can lead to various security issues such as privilege escalation, denial of service, or information disclosure.
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 analyze it for any open-source vulnerabilities, including this Kernel vulnerability.
Yes, a patch has been released in version v5.4.128 of the Linux Kernel. It is recommended to update to this version or a later one to fix the vulnerability.
The exact exploitability of this vulnerability is not yet proven. However, if an attacker gains access to the affected system, they could potentially exploit this vulnerability locally.
There are no known instances of this vulnerability being exploited in the wild. However, it is important to apply the necessary updates and security measures to mitigate the risk.
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