CVE-2020-27820 : What You Need to Know

A vulnerability was found in Linux kernel that could lead to a use-after-free issue in nouveau's postclose() handler.

Understanding CVE-2020-27820

This CVE identifies a specific vulnerability in the Linux kernel that could result in a use-after-free scenario.

What is CVE-2020-27820?

The vulnerability in the Linux kernel could trigger a use-after-free condition in nouveau's postclose() handler when removing a device, such as a video card, without powering off or by unbinding the driver.

The Impact of CVE-2020-27820

This vulnerability could potentially be exploited to execute arbitrary code or cause a denial of service (DoS) attack on affected systems.

Technical Details of CVE-2020-27820

Vulnerability Description

The issue arises due to a use-after-free condition in nouveau's postclose() handler within the Linux kernel.

Affected Systems and Versions

Product: Kernel
Vendor: Not applicable
Affected Version: to be fixed in RHEL-9 release

Exploitation Mechanism

The vulnerability can be exploited by manipulating the postclose() handler in nouveau when removing a device without proper power-off or by unbinding the driver.

Mitigation and Prevention

Immediate Steps to Take

Apply patches or updates provided by the vendor as soon as they are available.
Monitor vendor channels for the release of security updates related to this vulnerability.

Long-Term Security Practices

Regularly update and patch all software and systems to prevent known vulnerabilities.
Implement proper device removal procedures to minimize the risk of use-after-free scenarios.
Conduct regular security assessments and audits to identify and address potential vulnerabilities.

Patching and Updates

It is crucial to apply the fix provided in the RHEL-9 release to address the vulnerability in the Linux kernel.