CVE-2018-19406 Explained : Impact and Mitigation

The Linux kernel version 4.19.2 has a vulnerability in the function "kvm_pv_send_ipi" that can be exploited by local users to trigger a denial of service attack.

Understanding CVE-2018-19406

This CVE identifies a specific vulnerability in the Linux kernel version 4.19.2 that can lead to a denial of service condition.

What is CVE-2018-19406?

The vulnerability lies in the function "kvm_pv_send_ipi" within the "arch/x86/kvm/lapic.c" file. It allows local users to cause a denial of service by exploiting a NULL pointer dereference and a BUG when certain system calls are made, leaving the apic map uninitialized.

The Impact of CVE-2018-19406

The vulnerability can be exploited by individuals with local access to the system, potentially leading to a denial of service condition.

Technical Details of CVE-2018-19406

This section provides more technical insights into the CVE.

Vulnerability Description

The vulnerability in "kvm_pv_send_ipi" in the Linux kernel through version 4.19.2 allows local users to trigger a denial of service through crafted system calls that result in an uninitialized apic map.

Affected Systems and Versions

Affected System: Linux kernel version 4.19.2
Affected Users: Local users with access to the system

Exploitation Mechanism

Exploitation Type: Denial of Service (DoS)
Exploitation Vector: Local access to the system

Mitigation and Prevention

Protecting systems from CVE-2018-19406 requires specific actions to mitigate the risk.

Immediate Steps to Take

Monitor system calls and access by local users
Apply relevant patches or updates to the Linux kernel

Long-Term Security Practices

Implement the principle of least privilege for user access
Regularly update and patch the Linux kernel and associated components

Patching and Updates

Stay informed about security advisories related to the Linux kernel
Apply patches promptly to address known vulnerabilities