CVE-2017-8106 Explained : Impact and Mitigation
Learn about CVE-2017-8106, a vulnerability in Linux kernel versions 3.12 through 3.15 that allows privileged users of a KVM guest OS to cause a denial of service by exploiting the handle_invept function.
The Linux kernel versions 3.12 through 3.15 are affected by a vulnerability in the handle_invept function, allowing privileged users of a KVM guest OS to cause a denial of service by executing a specific instruction.
Understanding CVE-2017-8106
This CVE identifies a vulnerability in the Linux kernel that can be exploited by privileged users of a KVM guest OS, potentially leading to a denial of service.
What is CVE-2017-8106?
The handle_invept function in the Linux kernel versions 3.12 through 3.15 is susceptible to exploitation by privileged users of a KVM guest OS. By executing a single-context INVEPT instruction with a NULL EPT pointer, the vulnerability can trigger a crash in the host OS and a dereference of a NULL pointer.
The Impact of CVE-2017-8106
The vulnerability allows attackers with elevated privileges in a KVM guest OS to disrupt the host OS, potentially causing a denial of service by crashing the system.
Technical Details of CVE-2017-8106
The technical aspects of the CVE provide insight into the specific details of the vulnerability.
Vulnerability Description
The handle_invept function in the Linux kernel 3.12 through 3.15 allows privileged KVM guest OS users to trigger a denial of service through a NULL pointer dereference and host OS crash when executing a single-context INVEPT instruction with a NULL EPT pointer.
Affected Systems and Versions
- Linux kernel versions 3.12 through 3.15
Exploitation Mechanism
- Privileged users of a KVM guest OS exploit the handle_invept function by executing a single-context INVEPT instruction with a NULL EPT pointer, leading to a denial of service.
Mitigation and Prevention
Effective strategies to mitigate and prevent the exploitation of CVE-2017-8106.
Immediate Steps to Take
- Apply relevant security patches provided by the Linux kernel maintainers.
- Monitor for any unusual system behavior that could indicate exploitation of the vulnerability.
Long-Term Security Practices
- Regularly update the Linux kernel to ensure the latest security fixes are in place.
- Implement least privilege access controls to limit the impact of potential vulnerabilities.
Patching and Updates
- Stay informed about security advisories related to the Linux kernel and promptly apply patches to address known vulnerabilities.