CVE-2021-30178 : Security Advisory and Response
Learn about CVE-2021-30178, a vulnerability in the Linux kernel that allows attackers to execute arbitrary code. Find out how to mitigate this vulnerability.
An issue was discovered in the Linux kernel through 5.11.11. The function synic_get in arch/x86/kvm/hyperv.c experiences a NULL pointer dereference in certain accesses to the SynIC Hyper-V context, identified as CID-919f4ebc5987.
Understanding CVE-2021-30178
This section provides insights into the nature of the CVE-2021-30178 vulnerability.
What is CVE-2021-30178?
CVE-2021-30178 is a vulnerability found in the Linux kernel up to version 5.11.11. It involves a NULL pointer dereference in the synic_get function in hyperv.c under certain conditions related to the SynIC Hyper-V context with ID CID-919f4ebc5987.
The Impact of CVE-2021-30178
The vulnerability can be exploited by an attacker to cause a denial of service (DoS) condition or potentially execute arbitrary code on vulnerable systems.
Technical Details of CVE-2021-30178
In this section, the technical aspects of CVE-2021-30178 are explored.
Vulnerability Description
The vulnerability arises due to a NULL pointer dereference in the synic_get function of arch/x86/kvm/hyperv.c when handling certain accesses to the SynIC Hyper-V context.
Affected Systems and Versions
The vulnerability affects Linux kernel versions up to 5.11.11 that utilize the SynIC Hyper-V context in a specific manner.
Exploitation Mechanism
Attackers can exploit this vulnerability by crafting special requests to the synic_get function, leading to a NULL pointer dereference and potential system compromise.
Mitigation and Prevention
This section highlights key steps to mitigate and prevent the exploitation of CVE-2021-30178.
Immediate Steps to Take
It is recommended to apply the latest security updates provided by the Linux kernel maintainers to address this vulnerability promptly.
Long-Term Security Practices
Regularly updating the kernel and implementing robust security measures can help in preventing and mitigating vulnerabilities like CVE-2021-30178.
Patching and Updates
Users should ensure that their systems are regularly updated with the latest patches and security fixes released by the Linux kernel maintainers.