CVE-2019-15920 : What You Need to Know

A vulnerability has been found in the Linux kernel prior to version 5.0.10, specifically in the function SMB2_read in the file smb2pdu.c. This vulnerability involves a use-after-free issue that persisted even after the attempted fix in version 5.0.10.

Understanding CVE-2019-15920

This CVE identifies a use-after-free vulnerability in the Linux kernel's SMB2_read function.

What is CVE-2019-15920?

CVE-2019-15920 is a security vulnerability in the Linux kernel before version 5.0.10. The flaw is located in the SMB2_read function in the fs/cifs/smb2pdu.c file and involves a use-after-free vulnerability.

The Impact of CVE-2019-15920

The vulnerability could allow an attacker to exploit the use-after-free issue, potentially leading to a memory leak or other malicious activities.

Technical Details of CVE-2019-15920

This section provides more technical insights into the CVE.

Vulnerability Description

The vulnerability in the Linux kernel before version 5.0.10 is due to a use-after-free flaw in the SMB2_read function in the fs/cifs/smb2pdu.c file.

Affected Systems and Versions

Affected systems: Linux kernel versions before 5.0.10
Affected component: SMB2_read function in fs/cifs/smb2pdu.c

Exploitation Mechanism

The vulnerability can be exploited by an attacker to trigger a use-after-free condition in the SMB2_read function, potentially leading to a memory leak or other security compromises.

Mitigation and Prevention

Protecting systems from CVE-2019-15920 requires immediate actions and long-term security practices.

Immediate Steps to Take

Update to Linux kernel version 5.0.10 or later to mitigate the vulnerability.
Monitor for any signs of memory leaks or unusual system behavior.

Long-Term Security Practices

Regularly update the Linux kernel and other software components to patch known vulnerabilities.
Implement proper access controls and network segmentation to limit the impact of potential attacks.

Patching and Updates

Apply patches provided by the Linux kernel maintainers to address the use-after-free vulnerability.