CVE-2019-12455 : What You Need to Know

A vulnerability has been identified in the sunxi_divs_clk_setup function within the Linux kernel up to version 5.1.5, potentially leading to a denial of service. There is a dispute regarding the impact of this vulnerability.

Understanding CVE-2019-12455

This CVE involves an unchecked operation in the Linux kernel that could result in a denial of service.

What is CVE-2019-12455?

The vulnerability exists in the sunxi_divs_clk_setup function in the Linux kernel up to version 5.1.5. It involves an unchecked kstrndup operation that could be exploited by an attacker to trigger a denial of service, specifically a NULL pointer dereference and system crash.

The Impact of CVE-2019-12455

There is a disagreement regarding the severity of this vulnerability. Some argue that the memory allocation lacking validation occurs only during the boot process before user processes start, making it impossible for an unauthorized user to exploit it for a denial of service attack.

Technical Details of CVE-2019-12455

This section provides more technical insights into the vulnerability.

Vulnerability Description

The flaw involves an unchecked kstrndup operation on the derived_name variable, potentially enabling an attacker to trigger a denial of service.

Affected Systems and Versions

The vulnerability affects the Linux kernel up to version 5.1.5.

Exploitation Mechanism

An attacker could exploit the unchecked kstrndup operation to cause a denial of service, such as a NULL pointer dereference and system crash.

Mitigation and Prevention

Protecting systems from CVE-2019-12455 requires immediate actions and long-term security practices.

Immediate Steps to Take

Monitor official sources for patches and updates related to this vulnerability.
Implement security measures to detect and prevent denial of service attacks.

Long-Term Security Practices

Regularly update the Linux kernel to the latest secure version.
Conduct security assessments and audits to identify and mitigate potential vulnerabilities.

Patching and Updates

Apply patches provided by the Linux kernel maintainers to address the vulnerability and enhance system security.