CVE-2019-3896 Explained : Impact and Mitigation

In the Linux kernel 2.6 branch, a double-free vulnerability in idr_remove_all() function can allow an attacker to escalate privileges, crash the system, and cause a denial of service (DoS) attack.

Understanding CVE-2019-3896

This CVE involves a high severity vulnerability in the Linux kernel that can lead to privilege escalation and system crashes.

What is CVE-2019-3896?

The vulnerability in the idr_remove_all() function of the Linux kernel 2.6 branch can be exploited by an attacker with limited privileges to gain elevated access and disrupt system operations.

The Impact of CVE-2019-3896

CVSS Score: 7.0 (High)
Attack Vector: Local
Privileges Required: Low
Confidentiality Impact: High
Integrity Impact: High
Availability Impact: High

Technical Details of CVE-2019-3896

This section provides more in-depth technical information about the CVE.

Vulnerability Description

The vulnerability is a double-free issue in the idr_remove_all() function of the Linux kernel 2.6 branch, located in lib/idr.c.

Affected Systems and Versions

Product: Kernel
Vendor: The Linux Foundation
Affected Version: 2.6.32

Exploitation Mechanism

By exploiting this vulnerability, an attacker can potentially escalate their privileges, crash the system, and create a denial of service (DoS) condition.

Mitigation and Prevention

To address CVE-2019-3896, follow these mitigation strategies:

Immediate Steps to Take

Apply patches provided by the vendor promptly.
Monitor vendor channels for updates and advisories.
Restrict system access to trusted users only.

Long-Term Security Practices

Regularly update and patch the kernel and system components.
Implement the principle of least privilege to limit potential attack surfaces.
Conduct regular security assessments and audits.
Stay informed about security vulnerabilities and best practices.

Patching and Updates

Ensure that the affected systems are updated with the latest patches and security fixes.